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  4. Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO 4 and H 2 SO 4 ?

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Q. Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of $HgSO _{4}$ and $H _{2} SO _{4}$ ?

JEE MainJEE Main 2021Aldehydes Ketones and Carboxylic Acids

Solution:

Reaction of $HgSO _{4} / dil. H _{2} SO _{4}$ with alkyne gives addition of water as per markonikoff's rule.

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Hence $CH _{3}- CH _{2}- CHO$ cannot be form.

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