Which of the following is used to reduce phenol vapors to benzene?

Hydrogen gas

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Oleum

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Zinc dust

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Anhydrous

A l C l_{3}

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Solution

The correct option is C Zinc dust
Phenol is reduced to benzene by passing its vapors over heated zinc dust. In this reaction, phenoxide ion and a proton is formed. This proton accepts an electron from zinc and forms $Z n O$ and the phenoxide ion gets converted to benzene.

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