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Solution


Q.

Following are the four molecules “P”, “Q”, “R” and “S”. Which one among the four molecules will react with H-Br(aq) at the fastest rate         [2025]
1 Q  
2 R  
3 P  
4 S  

Ans.

(1)

The alkene that forms most stable carbocation intermediate reacts fastest with HBr. Carbocation formed by Q is stabilized by +M effect of OR hence is most stable.