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a
Alkynes are more reactive than alkenes towards halogen addition.
b
Alkenes are more reactive than alkynes towards halogen addition
c
Both alkynes and alkenes are equally reactive towards halogen addition
d
Primary vinylic cation RCH=C⊕H is less reactive than secondary vinylic cation RC⊕=C H,
answer is B.
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Detailed Solution
The triple bonds of alkynes, because of its high electron density, are easily attacked by electrophiles, but less reactive than alkenes due to the compact C-C electron cloud.