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Which compound is formed when o-xylene is oxidized with HNO3, and then on reaction with phenol in the presence of H2SO4 gives phenolphthalein?

1. o-Xylene
2. Phthalic anhydride
3. Phenol
4. Phenolphthalein

Correct answer: Phthalic anhydride

Solution

Phthalic anhydride is produced when o-xylene undergoes oxidation with HNO3, and this compound can subsequently react with phenol in the presence of H2SO4 to form phenolphthalein, making it the correct answer.

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