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Out of acetic acid, phenol, and n-hexanol, only one compound produces CO2 gas when treated with sodium bicarbonate. Identify the compound.

1. Acetic acid
2. Phenol
3. n-Hexanol
4. Methanol

Correct answer: Acetic acid

Solution

Acetic acid (CH3COOH) is a carboxylic acid and reacts with NaHCO3 to produce CO2 gas, unlike phenol and n-hexanol, which are weaker acids and do not react with NaHCO3.

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