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(B) The conversion of acetylene $(HC \equiv CH)$ to but$-2-$enal $(CH_3-CH=CH-CHO)$ involves two main steps: $1$. Hydration of acetylene using $H_2O /

Vedclass · Accepted Answer

$H_2O / Hg^{2+} / H^{+}$,dil. $NaOH$

Vedclass · Answer

(B) The conversion of acetylene $(HC \equiv CH)$ to but$-2-$enal $(CH_3-CH=CH-CHO)$ involves two main steps: $1$. Hydration of acetylene using $H_2O / Hg^{2+} / H^{+}$ gives acetaldehyde $(CH_3CHO)$. $2$. Aldol condensation of two molecules of acetaldehyde in the presence of dilute $NaOH$ yields but$-2-$enal. Reaction: $2CH_3CHO \xrightarrow{dil. NaOH} CH_3-CH=CH-CHO + H_2O$. Thus,the correct set of reagents is $H_2O / Hg^{2+} / H^{+}$ followed by dil. $NaOH$. Hence,$(B)$ is the correct answer.

The correct set of reagents which convert acetylene to but$-2-$enal are

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