A) \[\text{I }>\text{ II }>\text{ III }>\text{ IV}\]
B) \[~\text{II }>\text{ I }>\text{ III }>\text{ IV}\]
C) \[\text{IV }>\text{ 111 }>\text{ I }>\text{ II}\]
D) \[~\text{IV }>\text{ III }>\text{ II }>\text{ I}\]
Correct Answer: B
Solution :
The order of electrophilic addition (EA) is alkene > alkyne. But, if alkene has EWG (electron withdrawing group) reactivity of alkene is less than that of alkyne. ' Due to EWG electron density at \[\left( \text{C}=\text{C} \right)\] or nucleophilicity decreases, so addition of electrophile to \[\left( \text{C}=\text{C} \right)\] is slow. So, the decreasing order of EA is (II)-(alkene) > (I)-(alkyne) > (III)-(alkene with one EWG) > (IV)-(alkene with two EWGs).You need to login to perform this action.
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