The main product of the reaction of CH 3 CONH 2 with Br 2 in aqueous potassium hydroxide medium is

Question

The main product of the reaction of CH 3 CONH 2 with Br 2 in aqueous potassium hydroxide medium is (A) CH 3- CH 2- NH 2 (B) CH 3 Br (C) CH 3 CONHBr (D) CH 3 NH 2

Tardigrade Admin · Accepted Answer

This is Hoffmann's bromide reaction. In this reaction, product compound has one less '

C

' atom than reactant.
So it causes shortening of '

C

' chain.

-, CON H_{2} \to - N H_{2}

C H_{3} CON H_{2} + B r_{2} + 4 K O H \to C H_{3} N H_{2} + 2 K B r + 2 H_{2} O + K_{2} C O_{3}

Q. The main product of the reaction of $C H_{3} CON H_{2}$ with $B r_{2}$ in aqueous potassium hydroxide medium is

$C H_{3} - C H_{2} - N H_{2}$

$C H_{3} B r$

$C H_{3} CON H B r$

$C H_{3} N H_{2}$

This is Hoffmann's bromide reaction. In this reaction, product compound has one less ' $C$ ' atom than reactant.
So it causes shortening of ' $C$ ' chain.
$-, CON H_{2} \to - N H_{2}$
$C H_{3} CON H_{2} + B r_{2} + 4 K O H \to C H_{3} N H_{2} + 2 K B r + 2 H_{2} O + K_{2} C O_{3}$

Q. The main product of the reaction of CH3​CONH2​ with Br2​ in aqueous potassium hydroxide medium is

CH3​−CH2​−NH2​

CH3​Br

CH3​CONHBr

CH3​NH2​