The decreasing order of reactivity towards

Question:

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

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

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

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

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

Correct Option: , 3

Solution:

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

Carbocation formed from D is most stable

Carbocation formed from $A$ is least stable

 

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