CHEMISTRY ASSIGNMENT: AMINES

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CLASS XII – CHEMISTRY

AMINES

1. Arrange the following in increasing order of basic strength: a) C2H5NH2,C6H5NH2,NH3,C6H5CH2NH2,(C2H5)2NH

b) C2H5NH2,(C2H5)2NH,(C2H5)3N,C6H5NH2

c) CH3NH2,(CH3)2NH,(CH3)3N,C6H5NH2,C6H5CH2NH2

2. Write the chemical reaction of aniline with benzoyl chloride and write the name of the product.

3. Give one chemical test to distinguish between the following pairs of compounds: a) Methylamine and dimethylamine b) Ethylamine and aniline c) Aniline and benzylamine d) Secondary and tertiary amines e) Aniline and N-methylaniline

4. Account for the following: a) pKb of aniline is more than that of methylamine b) Ethylamine is soluble in water,whereas aniline is not. c) Although amino group is o- and p- directing in aromatic electrophilic substitution reactions ,aniline on nitration gives a substantial amount of mNitroaniline. d) Aniline does not undergo Friedel-Crafts reaction. e) Diazonium salts of aromatic amines are more stable than those of aliphatic amines. f) Gabriel Phthalimide synthesis is preferred for synthesising primary amines.

5. Distinguish between primary, secondary and tertiary amines.

6. Write short notes on the following: a) Carbylamine reaction b) Diazotisation c) Hoffmann’s bromamide reaction d) Ammonolysis e) Gabriel Phthalimide synthesis f) Coupling reaction

7. Give an example of a Zwitter ion.

8. Explain why an alkylamine is more basic than ammonia.

9. How can you convert an amide into an amine having one carbon atom less than the starting compound? Name the reaction

10. What is the role of pyridine in the acylation reaction of amines?