The intermediate compound formed when acetylene is hydrated in presence of dil. $H_{2} S O_{4}$ and $H g S O_{4}$ is:

acetaldehyde

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ethanol

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vinyl chloride

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ethenal

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Solution

The correct option is B ethanol
In this reaction "ethenol" forms as intermediate.

$H C \equiv C H + H_{2} O H_{2} S O_{4} (d i l .) - ------ \to H g S O_{4} H_{2} C = C H O H ⇌ H_{3} C - C H O (on rearrangement)$

Hence, the correct option is $B$

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