Unit 18: Organic Compounds Containing Nitrogen — Online MCQ Test
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Practice Unit 18: Organic Compounds Containing Nitrogen with a free chapter-wise online MCQ test.
This chapter covers: General methods of preparation. Properties reactions and uses. Amines: Nomenclature classification structure basic character and identification of primary secondary and tertiary am....
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Unit 18: Organic Compounds Containing Nitrogen — Important Questions & Answers
Which of the following amine will give the carbylamine test?
- A. N,N-dimethylaniline
- B. N-methylaniline
- C. Aniline
- D. Ethylamine
Answer: D. Ethylamine
Carbylamine test is specific to primary (1°) amines. Among the options provided, only aliphatic primary amines like ethylamine give this test.
Carbylamine test is specific to primary (1°) amines. Among the options provided, only aliphatic primary amines like ethylamine give this test.
The correct order of decreasing basic strength of the given amines is:
- A. N-methylaniline > benzenamine > ethanamine > N-ethylethanamine
- B. N-ethylethanamine > ethanamine > benzenamine > N-methylaniline
- C. N-ethylethanamine > ethanamine > N-methylaniline > benzenamine
- D. benzenamine > ethanamine > N-methylaniline > N-ethylethanamine
Answer: C. N-ethylethanamine > ethanamine > N-methylaniline > benzenamine
Secondary aliphatic amine > Primary aliphatic amine > N-methylaniline > Benzenamine. Basic strength depends on alkyl groups' electron-donating effect and resonance in aniline derivatives.
Secondary aliphatic amine > Primary aliphatic amine > N-methylaniline > Benzenamine. Basic strength depends on alkyl groups' electron-donating effect and resonance in aniline derivatives.
Given below are two statements: Statement I: Benzenediazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state. Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with KI.
- A. Both Statement I and Statement II are correct
- B. Both Statement I and Statement II are incorrect
- C. Statement I is correct but Statement II is incorrect
- D. Statement I is incorrect but Statement II is correct
Answer: A. Both Statement I and Statement II are correct
Both statements describe standard chemical properties and synthetic methodologies for benzenediazonium salts.
Both statements describe standard chemical properties and synthetic methodologies for benzenediazonium salts.
The correct statement regarding the basicity of arylamines is:
- A. Arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalized by interaction with the aromatic ring π electron system.
- B. Arylamines are generally more basic than alkylamines because of the aryl group.
- C. Arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridized.
- D. Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring π electron system.
Answer: D. Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring π electron system.
In arylamines, the lone pair on the nitrogen atom is delocalized into the aromatic ring via resonance, making it less available for protonation compared to alkylamines where the lone pair is localized.
In arylamines, the lone pair on the nitrogen atom is delocalized into the aromatic ring via resonance, making it less available for protonation compared to alkylamines where the lone pair is localized.
Which of the following compounds can form a zwitterion?
- A. Aniline
- B. Glycine
- C. Benzoic acid
- D. Acetanilide
Answer: B. Glycine
A zwitterion is an internal salt that carries both a positive and a negative charge simultaneously. Glycine (an amino acid, H₂N-CH₂-COOH) can exist as a zwitterion (⁺H₃N-CH₂-COO⁻) because it has both an amino group (basic) and a carboxyl group (acidic) that can undergo intramolecular proton transfer. The other options lack this combination of acidic and basic groups in the same molecule.
A zwitterion is an internal salt that carries both a positive and a negative charge simultaneously. Glycine (an amino acid, H₂N-CH₂-COOH) can exist as a zwitterion (⁺H₃N-CH₂-COO⁻) because it has both an amino group (basic) and a carboxyl group (acidic) that can undergo intramolecular proton transfer. The other options lack this combination of acidic and basic groups in the same molecule.