1. Which of the following is a secondary amine?
Answer:
Explanation:
In secondary amines, the nitrogen atom is bonded to two alkyl groups.
2. The reaction of nitrobenzene with Sn/HCl followed by treatment with NaOH gives:
Answer:
Explanation:
This is a reduction reaction where nitrobenzene is converted to aniline.
3. Diazonium salts are formed by the reaction of aniline with:
Answer:
Explanation:
Nitrous acid (HNO2) reacts with aniline to form diazonium salts.
4. Which of the following is a tertiary amine?
Answer:
Explanation:
In tertiary amines, the nitrogen atom is bonded to three alkyl groups.
5. The reaction of ethylamine with methyl isocyanate gives:
Answer:
Explanation:
This is an example of the formation of urethane from an amine and isocyanate.
6. The functional group present in acetamide is:
Answer:
Explanation:
Acetamide has the CONH2 group, which is an amide functional group.
7. The basicity of aniline is ___ than that of ammonia.
Answer:
Explanation:
Due to the electron-withdrawing nature of the benzene ring, aniline is less basic than ammonia.
8. The IUPAC name of (CH3)3N is:
Answer:
Explanation:
According to IUPAC nomenclature, it is named as Trimethylamine.
9. Which compound on reaction with HNO2 at 0°C forms a diazonium salt?
Answer:
Explanation:
Aniline reacts with HNO2 at 0°C to form a diazonium salt.
10. The product formed on the reaction of ethylamine with acetyl chloride is:
Answer:
Explanation:
This is an acylation reaction, leading to the formation of an amide.
11. Which of the following amines will not form a salt when treated with hydrochloric acid?
Answer:
Explanation:
Diazomethane is a neutral compound and does not react with acids like typical amines.
12. The major product formed when nitrobenzene is reduced using LiAlH4 is:
Answer:
Explanation:
LiAlH4 is a strong reducing agent and converts nitrobenzene directly to aniline.
13. Which of the following reactions of amines involves a carbocation intermediate?
Answer:
Explanation:
Alkylation of amines via alkyl halides involves a carbocation intermediate.
14. The product obtained by the reaction of ethylamine with benzoyl chloride is:
Answer:
Explanation:
The reaction between ethylamine and benzoyl chloride results in the formation of an amide.
15. Which of the following is an example of a nitrile?
Answer:
Explanation:
CH3CN has a CN group, which is characteristic of nitriles.
16. The Gabriel synthesis is primarily used for the preparation of:
Answer:
Explanation:
The Gabriel synthesis involves the reaction of phthalimide with alkyl halides to produce primary amines.
17. Which compound will give a positive Carbylamine test?
Answer:
Explanation:
The Carbylamine test is specific to primary amines. Aniline is a primary amine.
18. Which of the following reagents can convert a primary amine to a nitrile?
Answer:
Explanation:
The Carbylamine reaction involves the reaction of primary amines with chloroform in the presence of KOH to form isocyanides or nitriles.
19. Which of the following is not a method for the preparation of amines?
Answer:
Explanation:
Acylation of amines leads to the formation of amides, not amines.
20. Which of the following is a primary amide?
Answer:
Explanation:
Acetamide has the formula CH3CONH2, which makes it a primary amide.