p-Nitrobenzoic acid has higher `K_(a)` value than benzoic acid. Give reasons.

Explanation

To understand why p-nitrobenzoic acid has a higher \( K_a \) value than benzoic acid, we need to analyze the structures and the effects of substituents on their acidity.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- p-Nitrobenzoic acid (C₆H₄(NO₂)COOH) has a nitro group (-NO₂) at the para position relative to the carboxylic acid group (-COOH).
- Benzoic acid (C₆H₅COOH) is simply a benzene ring with a carboxylic acid group.

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