First slide

Alkynes

Question

Which of the statements are correct?

Moderate

A

Alkenes are more reactive than alkynes towards electrophilic addition reaction.
B

Alkynes are more reactive than alkenes towards nucleophilic addition reaction.
C

Catalytic hydrogenation of alkynes is more reactive than alkenes.
D

Catalytic hydrogenation of alkenes is more reactive than alkynes.

Solution

Alkenes are more reactive than alkynes towards electrophilic addition because the carbocation formed is more stable than the reaction formed during the electrophilic addition of alkynes
Alkynes are more reactive than alkenes towards nucleophilic addition reactions because the vinylic carbanion formed during nucleophlic addition to alkynes is more stable than alkyl carbanion which formed as inter mediate during nucleophilic addition to alkene
Alkynes suffer less steric hindrance during adsorption on the surface of catalyst,more reactive than alkene towards catalytic hydrogenation

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