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  4. The nucleophillic additions of alkynes can be explained on the basis that alkynes form vinylic. carbanion, while alkenes form alkyl carbanion when attacked by nucleophile ( ddotN u) <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/0a089556f46fdf2e4e0f4eafdd8fcb7d-.png /> Thus vinylic carbanion (due to more a character) will be more stable than the alkyl carbanion (due to less a character). Hence alkynes are more liable to be attacked by a nucleophile than alkenes. CH ≡ CH + C2H5OH xrightarrowHgSO4 Y xrightarrowH2O X X is

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Q. The nucleophillic additions of alkynes can be explained on the basis that alkynes form vinylic. carbanion, while alkenes form alkyl carbanion when
attacked by nucleophile $(\ddot{N} u)$
image
Thus vinylic carbanion (due to more a character) will be more stable than the alkyl carbanion (due to less a character). Hence alkynes are more liable to be attacked by a nucleophile than alkenes.
$CH \equiv CH + C_2H_5OH \xrightarrow{HgSO_4} Y \xrightarrow{H_2O} X$ X is

Hydrocarbons

Solution:

$CH \equiv CH + C_2H_5OH \rightarrow CH_2 = CH . OC_2H_5 \xrightarrow{H_2O} CH_3CHO + C_2H_5OH$