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