Benzoic acid gives benzene on being heated with X and phenol gives
benzene on being heated with Y. Therefore X and Y are respectively

Zn dust and NaOH

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Zn dust and sodalime

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Zn dust and NaOH

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Sodalime and zinc dust

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Solution

The correct option is D Sodalime and zinc dust
When sodium benzonate is heated with sodalime ( a mixture of $N a O H$ and $C a O$ ), benzene and sodium carbonate is obtain through decarboxylation.

When phenol reacts with Zn dust, benzene is formed. Hence, the correct answer is option (a).

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