JEE Main Chemistry question

Addition of a halogen acid (HX) occurs at the slowest rate in

(A)CH=CHClCorrect
(B)CH=CH
(C)CH–CH=CH
(D)(CH)C=CH

Answer: (A)

Solution

Electrophilic addition of HX proceeds through a carbocation intermediate; a halogen substituent directly on the alkene carbon strongly destabilises the developing positive charge by induction (its weak

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Question ID VK-142476