Chapter 22, Problem 22.16P

Interpretation Introduction

(a)

Interpretation:

The product formed on reaction of phenylacetic acid when treated with ${\text{Br}}_2$ and one equivalent of ${\text{PBr}}_{\text{3}}$, followed by large excess of ethanol is to be stated.

Concept introduction:

Carboxylic acid is a class of organic compound that contains a $-\text{COOH}$ group attached with a hydrocarbon chain. Bromination occurs at $\alpha$ carbons of carboxylic acids on reaction with ${\text{Br}}_{\text{2}}$ and a catalytic amount of ${\text{PBr}}_{\text{3}}$. This reaction is known as Hell-Volhard-Zelinsky reaction. The $\alpha$ carbon is the carbon adjacent to the carboxyl group.

Interpretation Introduction

(b)

Interpretation:

The product formed on reaction of propionic acid when treated with ${\text{Br}}_2$ and one equivalent of ${\text{PBr}}_{\text{3}}$, followed by large excess of ammonia is to be stated.

Concept introduction:

Carboxylic acid is a class of organic compound contains a $-\text{COOH}$ group attached with a hydrocarbon chain. Bromination occurs at $\alpha$ carbons of carboxylic acids on reaction with ${\text{Br}}_{\text{2}}$ and a catalytic amount of ${\text{PBr}}_{\text{3}}$. This reaction is known as Hell-Volhard-Zelinsky reaction. The $\alpha$ carbon is the carbon adjacent to the carboxyl group.