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(C) The reactivity towards $E_1$ reaction depends on the stability of the carbocation intermediate formed after the loss of the leaving group $(Cl^-)$

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$D > B > C > A$

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(C) The reactivity towards $E_1$ reaction depends on the stability of the carbocation intermediate formed after the loss of the leaving group $(Cl^-)$.$(A)$ $CH_3CH_2CH_2CH_2^+$ (Primary carbocation,least stable)$(B)$ $CH_2=CHCH_2CH_2^+$ (Primary allylic carbocation,stabilized by resonance)$(C)$ $CH_3CH_2CH^+CH_3$ (Secondary carbocation)$(D)$ $CH_2=CHCH^+CH_3$ (Secondary allylic carbocation,highly stabilized by resonance)Comparing the stability: The secondary allylic carbocation $(D)$ is more stable than the primary allylic carbocation $(B)$,which is more stable than the secondary alkyl carbocation $(C)$,which is more stable than the primary alkyl carbocation $(A)$.Therefore,the order of reactivity is $D > B > C > A$.

The decreasing order of reactivity towards dehydrohalogenation $(E_1)$ reaction of the following compounds is:
$(A)$ $CH_3CH_2CH_2CH_2Cl$
$(B)$ $CH_2=CHCH_2CH_2Cl$
$(C)$ $CH_3CH_2CHClCH_3$
$(D)$ $CH_2=CHCHClCH_3$

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The decreasing order of reactivity towards dehydrohalogenation $(E_1)$ reaction of the following compounds is:$(A)$ $CH_3CH_2CH_2CH_2Cl$$(B)$ $CH_2=CHCH_2CH_2Cl$$(C)$ $CH_3CH_2CHClCH_3$$(D)$ $CH_2=CHCHClCH_3$