The decreasing order of reactivity towards dehydrohalogenation

Question:

The decreasing order of reactivity towards dehydrohalogenation $\left(E_{1}\right)$ reaction of the following compounds is:

  1. $\mathrm{D}>\mathrm{B}>\mathrm{C}>\mathrm{A}$

  2. $\mathrm{B}>\mathrm{D}>\mathrm{A}>\mathrm{C}$

  3. $\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$

  4. $B>A>D>C$

Correct Option: 1

Solution:

$\mathrm{E}_{1}$ reaction proceeds via carbocation formation, therefore greater the stability of carbocation, faster will be the $\mathrm{E}_{1}$ reaction.

Thus correct decreasing order of the given halides towards dehydrohalogenation by $E_{1}$ is 

$\mathrm{D}>\mathrm{B}>\mathrm{C}>\mathrm{A}$

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