(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(A), (B) and (C) are narcotic analgesics

(B), (C) and (D) are tranquillizers

(A) and (D) are tranquillizers

(B) and (C) are tranquillizers

The intermolecular association in primary amines is less than the intermolecular association in secondary amines.

Primary amines on treating with nitrous acid solution from corresponding alcohols except mythyl amine.

Primary amines are less basic than the secondary amines.

Primary amines can be prepared by the Gabriel phthalimide synthesis.