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 $Br _2$ 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 $Br _2$ in the presence of sodium hydroxide to give ethylamine.
$\underset{\text { Propanamide }}{ CH _3 CH _2 CONH _2} \xrightarrow[ NaOH ] { Br _2}
\underset{\text { Ethanamineor ethylamine }}{ CH _3 CH _2 NH _2}+ CO _2$
This reaction is known as Hofmann degeadation reaction.
So, (c) is incorrect about amines.