Which of the following reactions forms an ald | vedclass

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(A) The hydration of alkynes in the presence of $Hg^{+2}/H_3O^{\oplus}$ follows Markovnikov's addition of water to form an enol,which then tautomerize

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$CH \equiv CH \xrightarrow[333 \ K]{Hg^{+2}/H_3O^{\oplus}}$

Vedclass · Answer

(A) The hydration of alkynes in the presence of $Hg^{+2}/H_3O^{\oplus}$ follows Markovnikov's addition of water to form an enol,which then tautomerizes to a carbonyl compound.$1$. For $CH \equiv CH$ (ethyne),the product is $CH_3CHO$ (acetaldehyde),which is an aldehyde.$2$. For $CH_3 - C \equiv CH$ (propyne),the product is $CH_3 - CO - CH_3$ (acetone),which is a ketone.$3$. For $CH_3 - C \equiv C - CH_3$ (but$-2-$yne),the product is $CH_3 - CO - CH_2 - CH_3$ (butanone),which is a ketone.Therefore,only reaction $A$ produces an aldehyde.

Which of the following reactions forms an aldehyde as a product?

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