Class 12 Chemistry (NCERT)

1. Amines act primarily as:

• A. Lewis bases
• B. Lewis acids
• C. Neutral, non-reactive compounds
• D. Strong oxidizing agents

2. Aniline is a weaker base than methylamine mainly because:

• A. The lone pair on nitrogen is delocalized into the benzene ring
• B. Aniline has a much higher molecular weight
• C. Methylamine lacks a lone pair on nitrogen
• D. Aniline is aromatic and therefore chemically neutral

3. The Hofmann bromamide degradation reaction converts:

• A. An amide into a primary amine with one carbon less
• B. An amine into an amide
• C. A nitrile into an amine
• D. An amide into a nitrile

4. The carbylamine (isocyanide) test is a positive characteristic test for:

• A. Primary amines
• B. Secondary amines
• C. Tertiary amines
• D. All classes of amines equally

5. Aromatic diazonium salts are prepared by treating a primary aromatic amine with:

• A. NaNO2 and HCl at 273-278 K
• B. NaOH at room temperature
• C. Concentrated H2SO4 alone
• D. KMnO4

6. The Gabriel phthalimide synthesis is a method used to prepare:

• A. Pure primary amines, free from secondary/tertiary contamination
• B. Secondary amines selectively
• C. Tertiary amines selectively
• D. Quaternary ammonium salts

7. Considering basicity in the gas phase, the general order among methylamine, dimethylamine, trimethylamine and ammonia is:

• A. Tertiary > Secondary > Primary > Ammonia
• B. Ammonia > Primary > Secondary > Tertiary
• C. Primary > Secondary > Tertiary > Ammonia
• D. All four show identical basicity

8. Amines can be distinguished from amides mainly on the basis of their:

• A. Basic character, since amides are essentially neutral
• B. Equal basicity, since both behave identically
• C. Amides being more basic than amines
• D. The complete absence of any distinguishing test

9. The coupling reaction of a diazonium salt with phenol produces a(n):

• A. Azo dye
• B. Simple amine
• C. Nitro compound
• D. Alcohol

10. Aniline, obtained by reduction of nitrobenzene, is an important starting material in the synthesis of:

• A. Sulfa drugs (via sulfanilamide)
• B. Simple alkanes
• C. Ethers
• D. Carboxylic acids directly

11. Reaction of a primary amine with chloroform and alcoholic KOH produces:

• A. An isocyanide (carbylamine) with a foul smell
• B. An amide
• C. A nitrile
• D. A diazonium salt

12. Catalytic or chemical reduction of nitrobenzene gives:

• A. Aniline
• B. Nitrosobenzene as the final stable product
• C. Benzene
• D. Phenol