Among the following organic halides,arrange t | vedclass

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(A) Dehydrohalogenation via the $E2$ mechanism is favored by the stability of the transition state,which is influenced by the degree of substitution o

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$A < B < C < D$

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(A) Dehydrohalogenation via the $E2$ mechanism is favored by the stability of the transition state,which is influenced by the degree of substitution of the alkyl halide. The reactivity order for dehydrohalogenation is $3^{\circ} > 2^{\circ} > 1^{\circ}$ alkyl halides due to the formation of more substituted (stable) alkenes (Saytzeff's rule).The given compounds are:$(A)$ $CH_3-CH_2-Br$ ($1^{\circ}$ halide)$(B)$ $CH_3-CH_2-CH_2-Br$ ($1^{\circ}$ halide)$(C)$ $CH_3-CH(Br)-CH_3$ ($2^{\circ}$ halide)$(D)$ $(CH_3)_3-CBr$ ($3^{\circ}$ halide)Comparing the $1^{\circ}$ halides,$CH_3-CH_2-Br$ is less reactive than $CH_3-CH_2-CH_2-Br$ due to steric and electronic factors. Thus,the increasing order of reactivity is $A < B < C < D$.

Among the following organic halides,arrange them in the increasing order of their dehydrohalogenation reactions in the presence of alcoholic $KOH$:
$(A)$ $CH_3-CH_2-Br$
$(B)$ $CH_3-CH_2-CH_2-Br$
$(C)$ $CH_3-CH(Br)-CH_3$
$(D)$ $(CH_3)_3-CBr$

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Among the following organic halides,arrange them in the increasing order of their dehydrohalogenation reactions in the presence of alcoholic $KOH$:$(A)$ $CH_3-CH_2-Br$$(B)$ $CH_3-CH_2-CH_2-Br$$(C)$ $CH_3-CH(Br)-CH_3$$(D)$ $(CH_3)_3-CBr$