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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