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Q. The amine which will NOT liberate nitrogen with nitrous acid is

COMEDKCOMEDK 2012Amines

Solution:

Only aliphatic primary amines react with nitrous acid to give alcohols with the evolution of $N_2$ gas.
$ R - NH_2 + HONO \xrightarrow{273-278 K} R -OH + N_2 + H_2 O$