MEDIUMMCQ SINGLEJEE Mains ChemistryOrganic ChemistryAldehydes and ketonesPreparation of Aldehydes & Ketones

Which of the following gases when passed through warm dilute solution of H2SO4 in presence of HgSO4 gives acetaldehyde?

A.CH4

B.C2H6

C.C2H4

D.C2H2✓ Correct

Explanation

When acetylene reacts with dilute sulphuric acid in presence of mercuric sulphate, an aldehyde is formed. The reaction is- 퐻퐶≡퐶퐻 퐻푔푆푂4/퐻2푆푂4 → 퐶퐻3퐶퐻푂 Acetylene is a gas and it forms acetaldehyde. Therefore, the correct answer is option (d) 퐶2퐻2.

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