The decreasing order of reactivity towards dehydrohalogenation (E_{1}) reaction of the following compounds is: 
Option: 1 B>A>D>C
Option: 2 B>D>C>A
Option: 3 B>D>A>C
Option: 4 D>B>C>A
 

Answers (1)

Mechanism

 


E1 reaction proceeds via carbocation formation, therefore greater the stability of carbocation, faster the E1 reaction.

Therefore, Option(4) is correct.

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