Give various functional isomers of butanoic acid and give their isomeric relations.

Explanation

To find the various functional isomers of butanoic acid and their isomeric relations, we can follow these steps:

### Step 1: Identify the Structure of Butanoic Acid
Butanoic acid is a carboxylic acid with the molecular formula C4H8O2. Its structure can be represented as:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{COOH} \]
This indicates that it has a carboxyl group (-COOH) attached to a four-carbon chain.

### Step 2: Determine Possible Functional Isomers
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