Why is the bond length of C=O in carboxylic acids slightly larger than that in aldehydes and ketons ?

Explanation

To understand why the bond length of C=O in carboxylic acids is slightly larger than that in aldehydes and ketones, we can break down the explanation into several steps:

### Step 1: Understanding the Structures
- **Carboxylic Acid**: The structure of a carboxylic acid can be represented as RCOOH (where R is an alkyl group). For example, CH3COOH (acetic acid).
- **Aldehyde**: The structure of an aldehyde is RCHO. For example, CH3CHO (acetaldehyde).
- **Ketone**: The structure of a ketone is RCOR' (where R and R' are alkyl groups). For example, CH3COCH3 (acetone).

### Step 2: Bond Length Comparison
...