The catalytic hydration of terminal alkynes (using dilute and ) generally yields ketones according to Markovnikov's rule. However, which specific alkyne is the sole exception that yields an aldehyde?

Question

The catalytic hydration of terminal alkynes (using dilute $H_2SO_4$ and $HgSO_4$) generally yields ketones according to Markovnikov's rule. However, which specific alkyne is the sole exception that yields an aldehyde?

Prashant Kotian · Accepted Answer

Correct answer: C. Ethyne () undergoes hydration to form vinyl alcohol, which immediately tautomerizes to acetaldehyde (). All other terminal alkynes yield methyl ketones.

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