Q41 / 180 · COMEDK 2012 · Chemistry

The amine which will not liberate nitrogen with nitrous acid is

  • A
    ethyl amine
  • B
    methyl amine
  • Correct answer
    C
    dimethyl amine
  • D
    2-amino propane

Solution

Only aliphatic primary amines react with nitrous acid to give alcohols with the evolution of $N_{2}$ gas. $$ R-\mathrm{NH}_{2}+\mathrm{HONO} \stackrel{273-278 \mathrm{~K}}{\longrightarrow} R-\mathrm{OH}+\mathrm{N}_{2}+\mathrm{H}_{2} \mathrm{O} $$ $\because$ Dimethyl amine is a secondary amine, it will not give $\mathrm{N}_{2}$ gas.

Hence, the correct answer is option: 'C'.

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