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NEET levelSingle correct optionDifficulty 1 of 3hc112

Ethyne is hydrated with dilute $H X_{2} SO X_{4}$ and $HgSO X_{4}$ at 333 K. The main product is

Aethane-1,2-diol
Bethanal, $CH X_{3} CHO$
Cethanol, $CH X_{3} CH X_{2} OH$
Dethanoic acid, $CH X_{3} COOH$

Answer: B

Addition of water to ethyne under

Hg X^{2 +}

catalysis gives the enol

CH X_{2} = CHOH

(vinyl alcohol), which tautomerises to the carbonyl form. The product is ethanal.

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