Aromatic carboxylic acids do not undergo Friedel crafts reaction. Explain.

Explanation

**Step-by-Step Solution:**

1. **Understanding Friedel-Crafts Reactions**: Friedel-Crafts reactions are electrophilic aromatic substitution reactions that involve the alkylation or acylation of aromatic compounds. They typically require a Lewis acid catalyst (like AlCl3 or FeCl3) to generate a carbocation or acylium ion that can react with the aromatic ring.

2. **Nature of Aromatic Carboxylic Acids**: Aromatic carboxylic acids, such as benzoic acid, contain a carboxyl (-COOH) group attached to the aromatic ring. This functional group is known to be a deactivating group in electrophilic aromatic substitution reactions.

3. **Deactivating Effect of the Carboxyl Group**: The carboxyl group withdraws electron density from the aromatic ring due to its electronegative oxygen atoms and resonance effects. This reduction in electron density makes the aromatic ring less reactive towards electrophiles, such as the carbocation generated in Friedel-Crafts reactions.

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