Phenols are prepared from benzene in the presence of:

alum

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oleum

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vinegar

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all of these

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Solution

The correct option is A oleum
Oleum is used to convert benzene into benzene sulfonic acid. This benzene sulfonic acid is further treated with NaOH and after acidification phenol is obtained.

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Phenol is reduced to benzene in presence of:

H_{2} S O_{4}

N a O H

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