Textbook Problem

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Identify each compound according to its functional group:

Interpretation Introduction

Interpretation:

The given compounds on the basis of their functional groups are to be identified.

Concept Introduction:

The additional atoms or groups present on a hydrocarbon chain are called the functional group. The functional group is the reactive center of a compound.

Organic compounds are classified on the basis of their functional groups. Compounds with similar functional groups belong to the same class and have similar properties.

Explanation of Solution

a)

In the given compound, the $-\text{COOH}$ group is bonded to an alkyl group. This group is called a carboxylic acid functional group. Due to the presence of this functional group, the compound is identified as carboxylic acid. The name of this compound is methanoic acid

b)

The given compound is an aromatic compound. It is an aromatic hydrocarbon because there is a benzene ring and only C and H are present. Due to this, the compound is identified as an aromatic hydrocarbon