Amine classification, structure, nomenclature, and basicity
Question 1
Which statement gives the sound Class XII chemistry for ‘Amine classification, structure, nomenclature, and basicity’?
(a)Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
(b)Only the name of the substance is needed for amine classification, structure, nomenclature, and basicity; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)The same conclusion about amine classification, structure, nomenclature, and basicity remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(d)For amine classification, structure, nomenclature, and basicity, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer
(a) Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Question 2
Which principle should be retained when checking an inference about ‘Amine classification, structure, nomenclature, and basicity’?
(a)The same conclusion about amine classification, structure, nomenclature, and basicity remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(b)Only the name of the substance is needed for amine classification, structure, nomenclature, and basicity; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
(d)For amine classification, structure, nomenclature, and basicity, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer
(c) Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Question 3
Which statement survives a structure, equation, reagent, and condition audit for amine classification, structure, nomenclature, and basicity?
(a)For amine classification, structure, nomenclature, and basicity, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(b)Only the name of the substance is needed for amine classification, structure, nomenclature, and basicity; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)The same conclusion about amine classification, structure, nomenclature, and basicity remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(d)Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Show answer
(d) Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Amines are classified by carbon groups attached to nitrogen, not by alkyl-carbon class. Their pyramidal structure, lone pair, solvation, resonance, inductive effects, and steric effects jointly determine basicity in gas and aqueous phases.
Preparation of amines
Question 4
Which statement gives the sound Class XII chemistry for ‘Preparation of amines’?
(a)For preparation of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(b)Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
(c)The same conclusion about preparation of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(d)Only the name of the substance is needed for preparation of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer
(b) Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Question 5
Which principle should be retained when checking an inference about ‘Preparation of amines’?
(a)The same conclusion about preparation of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(b)Only the name of the substance is needed for preparation of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)For preparation of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(d)Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Show answer
(d) Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Question 6
Which statement correctly governs a new case involving preparation of amines?
(a)Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
(b)For preparation of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(c)Only the name of the substance is needed for preparation of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(d)The same conclusion about preparation of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
Show answer
(a) Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Amines are prepared by ammonolysis, reduction of nitro compounds, nitriles and amides, Gabriel synthesis, and Hofmann bromamide degradation. Each route has substrate limits and may change the carbon count.
Chemical reactions and tests of amines
Question 7
Which statement gives the sound Class XII chemistry for ‘Chemical reactions and tests of amines’?
(a)For chemical reactions and tests of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(b)Only the name of the substance is needed for chemical reactions and tests of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
(d)The same conclusion about chemical reactions and tests of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
Show answer
(c) Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Question 8
Which principle should be retained when checking an inference about ‘Chemical reactions and tests of amines’?
(a)Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
(b)Only the name of the substance is needed for chemical reactions and tests of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)For chemical reactions and tests of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(d)The same conclusion about chemical reactions and tests of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
Show answer
(a) Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Question 9
Which statement survives a structure, equation, reagent, and condition audit for chemical reactions and tests of amines?
(a)The same conclusion about chemical reactions and tests of amines remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(b)Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
(c)Only the name of the substance is needed for chemical reactions and tests of amines; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(d)For chemical reactions and tests of amines, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer
(b) Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Amine reactions include alkylation, acylation, carbylamine testing, nitrous-acid chemistry, and aromatic electrophilic substitution. Product depends on whether the amine is primary, secondary, tertiary, aliphatic, or aromatic.
Diazonium salts: preparation and replacement reactions
Question 10
Which statement gives the sound Class XII chemistry for ‘Diazonium salts: preparation and replacement reactions’?
(a)The same conclusion about diazonium salts: preparation and replacement reactions remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(b)Only the name of the substance is needed for diazonium salts: preparation and replacement reactions; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(c)For diazonium salts: preparation and replacement reactions, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(d)Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Show answer
(d) Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Question 11
Which principle should be retained when checking an inference about ‘Diazonium salts: preparation and replacement reactions’?
(a)Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
(b)For diazonium salts: preparation and replacement reactions, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(c)The same conclusion about diazonium salts: preparation and replacement reactions remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(d)Only the name of the substance is needed for diazonium salts: preparation and replacement reactions; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer
(a) Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Question 12
Which statement correctly governs a new case involving diazonium salts: preparation and replacement reactions?
(a)Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
(b)The same conclusion about diazonium salts: preparation and replacement reactions remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(c)Only the name of the substance is needed for diazonium salts: preparation and replacement reactions; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(d)For diazonium salts: preparation and replacement reactions, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
Show answer
(a) Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Aromatic primary amines form diazonium salts at 273–278 K. Diazonium nitrogen can be replaced by halide, cyanide, hydroxyl, hydrogen, or other groups under specific reagents, making diazonium chemistry a versatile aromatic synthesis route.
Azo coupling and synthetic applications
Question 13
Which statement gives the sound Class XII chemistry for ‘Azo coupling and synthetic applications’?
(a)For azo coupling and synthetic applications, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(b)The same conclusion about azo coupling and synthetic applications remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(c)Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
(d)Only the name of the substance is needed for azo coupling and synthetic applications; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer
(c) Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Question 14
Which principle should be retained when checking an inference about ‘Azo coupling and synthetic applications’?
(a)Only the name of the substance is needed for azo coupling and synthetic applications; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
(b)Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
(c)For azo coupling and synthetic applications, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(d)The same conclusion about azo coupling and synthetic applications remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
Show answer
(b) Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Question 15
Which statement correctly governs a new case involving azo coupling and synthetic applications?
(a)The same conclusion about azo coupling and synthetic applications remains valid after changing the reagent, molecular structure, medium, or condition that controls the result.
(b)Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
(c)For azo coupling and synthetic applications, the relevant direction, trend, product ordering, or cause-and-effect relation is always the exact reverse of the governing rule.
(d)Only the name of the substance is needed for azo coupling and synthetic applications; equations, structures, stoichiometry, evidence, and conditions cannot change the answer.
Show answer
(b) Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Diazonium ions couple with activated aromatic rings such as phenols and anilines to form coloured azo compounds, with pH controlling activation and orientation. Synthetic sequences must preserve the temperature and reagent requirements of diazotisation and coupling.
Ethylamine is secondary because its ethyl group has two carbons.
Why it feels right. I count carbons rather than the groups directly attached to nitrogen.
Right
Primary, secondary and tertiary amines have one, two and three carbon groups bonded to nitrogen, respectively.
Worked example
Ethylamine
NC₂H₅
1 carbon group
Dimethylamine
NCH₃CH₃
2 carbon groups
Count carbon groups bonded directly to the nitrogen. The ethyl group counts once even though it contains two carbons.
In CH₃CH₂NH₂, nitrogen bonds to one ethyl group.
In (CH₃)₂NH, it bonds to two methyl groups.
Only the second amine is secondary.
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