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JEE Main levelSingle correct optionDifficulty 2 of 3ap116

Sodium phenoxide is heated with $CO X_{2}$ at 4-7 atm and 400 K, and the product is then treated with dilute $H X_{2} SO X_{4}$ . The major product is

A2-hydroxybenzaldehyde
B4-hydroxybenzoic acid
Cbenzoic acid
D2-hydroxybenzoic acid

Answer: D

This is the Kolbe-Schmidt reaction. The phenoxide ion attacks the weak electrophile

CO X_{2}

at the ortho position (sodium salt, 400 K, 4-7 atm), and acidification liberates 2-hydroxybenzoic acid (salicylic acid).

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