- For an amine RNH2, write an expression to indicate its basic strength.
2. Give one use of quaternary ammonium salts.
Ans. Quaternary ammonium salts are widely used for manufacture of synthetic detergents.
3. Give one example of Hoffmann – Bromamide reaction
Ans. In Hoffmann – Bromamide reaction an acid amide is reacted with Bromine in presence of a base to give a primary amine having one carbon less than the starting amide.
4. Distinguish between ethylamine and aniline.
Ans. Ethylamine and aniline can be distinguished by azodye test. On treating aniline with benzene diazonium salt, orange or red coloured azodye is formed which is not formed with ethyl amine.
5.The IUPAC name of secondary amine having lowest molecular mass is _________.
Ans. N- Methylmethanamine.
6.Give an example of diazotization
Ans. During diazotization benzene diazonium chloride is prepared by the reaction of aniline with nitrous acid at 273 – 278 K
7. Write one use of diazonium salt
Ans.Diazonium salts are used in preparation of substituted aromatic compounds.
8.How can the reactivity of aromatic amines be controlled?
Ans.The reactivity of aromatic amines can be controlled by acylation.
9.Give one use of tertiary amines.
Ans.Tertiary amines like trimethylamine are used as insect attractants.
10. Name a reagent which can distinguish between primary, secondary and tertiary amine
Ans. P- Toluenesulphonyl chloride Hinsberg reagent can be used as a distinguishing reagent for primary, secondary and tertiary amines.
11.Give IUPAC name of
Ans.N- methyl -3 – nitro -1- butanamine
Ans.N, N – dimethylpropanamine
Ans.N- methyl -2- aminopropanamine
Ans.2- Methyl propane
Ans. N – Ethyl pentan-2-amine
Ans.N, N – Dimethyl-4-nitro aniline
12.Write structure of following
(i) Aminobut -2- ene
(ii) N- Methyl –N- ethylaniline
(iii) N- Ethyl -2- pentanamine
(iv) 2,4,6 – Tribromoaniline
(v) N, N- Dimethyl methanamine
(vi) N- Phemylaniline
(vii) 3-Phenyl propanamine
13.Classify the following amines as primary, secondary or tertiary:
Ans.Primary: (i) and (iii)