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Chem Chemistry

ChemistryNEB 2081 (MCQs)

Benzoic acid gives benzene on being heated with 'X' and phenol gives benzene on being heated with 'Y'. Therefore, X and Y are respectively: a) Sodalime and copper b) Zn dust and NaOH c) Zn dust and…

1

Benzoic acid gives benzene on being heated with 'X' and phenol gives benzene on being heated with 'Y'. Therefore, X and Y are respectively: a) Sodalime and copper b) Zn dust and NaOH c) Zn dust and sodalime d) Sodalime and Zn dust

Answer

· Based on the official syllabus and past papers
Updated

Benzoic acid undergoes decarboxylation when heated with sodalime (NaOH + CaO) to yield benzene. The reaction is as follows:

benzoic acidbenzoic acid+NaOH+CaOΔ (heat)benzenebenzene+Na2CO3
Decarboxylation of benzoic acid with sodalime (NaOH + CaO) to form benzene

On the other hand, phenol is converted to benzene by reduction using zinc dust (Zn) at high temperatures:

phenolphenol+Znhigh temperaturebenzenebenzene+ZnO
Reduction of phenol to benzene using zinc dust

Thus, X is sodalime and Y is zinc dust.

The correct option is (d) Sodalime and Zn dust.

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