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

1. Soda-lime and copper
2. Zn dust and NaOH
3. Zn dust and soda-lime
4. Soda-lime and zinc dust

Correct answer: Soda-lime and zinc dust

Solution

Benzoic acid undergoes decarboxylation with soda-lime to form benzene, while phenol reacts with zinc dust to produce benzene. Thus, X is soda-lime and Y is zinc dust.

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