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  4. The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is :

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Q. The decreasing order of reactivity towards dehydrohalogenation $(E_1)$ reaction of the following compounds is :Chemistry Question Image

JEE MainJEE Main 2020Haloalkanes and Haloarenes

Solution:

Reactivity $D > B > C > A$
Carbocation formed from $D$ is most stable Carbocation formed from $A$ is least stable