Question

Which of the following is not a correct statement for primary aliphatic amines?

• A. Primary amines are less basic than the secondary amines.
• B. Primary amines on treating with nitrous acid solution form corresponding alcohols except methyl amine.
• C. Primary amines can be prepared by the Gabriel phthalimide synthesis.
• D. The intermolecular association in primary amines is less than the intermolecular association in secondary amines

Answer 1

The correct option is D The intermolecular association in primary amines is less than the intermolecular association in secondary amines

(a) Aliphatic amines with nitrous acid form unstable diazonium salt which decomposes to give alcohols.
Methyl amine when reacts with nitrous acid forms mixture of dimethyl ether, methyl nitride and some methanol.

(b) Intermolecular association due to H-bonding in primary amines is more than in secondary amines because primary amines have more number of H-atoms bonded N-atom.

(c) Primary amines can be prepared by the Gabriel phthalimide synthesis.
(d) Secondary amines are more basic than primary amines due to +I effect of alkyl groups.

Hence, option (b) is the incorrect statement.