Question

Which one of the following is not correct with respect to properties of amines?

• A. $p{K}_b$ of aniline is more than that of methylamine.
• B. Ethylamine is soluble in water whereas aniline is not.
• C. Ethanamide on reaction with $B{r}_2$ and $NaOH$ gives ethylamine.
• D. Ethylamine reacts with nitrous acid to give ethanol.
• E. Aniline does not undergo Friedel-Crafts reaction.

Answer 1

Answer: (C)

Instead of ethanamide, propanamide reacts with $B{r}_2$ in the presence of sodium hydroxide to give ethylamine.
$\underset{\text{ Propanamide }}{C{H}_{3}C{H}_{2}CON{H}_2}\underset{NaOH}{\overset{B{r}_2}{\to }}<br/>\underset{\text{ Ethanamineor ethylamine }}{C{H}_{3}C{H}_{2}N{H}_2}+C{O}_2$
This reaction is known as Hofmann degeadation reaction.
So, (c) is incorrect about amines.