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(B) The reactivity of alkyl halides towards hydrolysis (via $S_N1$ mechanism) depends on the stability of the carbocation intermediate formed.$(IV)$ f

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$IV > II > I > III$

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(B) The reactivity of alkyl halides towards hydrolysis (via $S_N1$ mechanism) depends on the stability of the carbocation intermediate formed.$(IV)$ forms a secondary dibenzylic carbocation $C_6H_5-C^+H-C_6H_5$,which is highly stable due to resonance with two phenyl rings.$(II)$ forms a secondary benzylic carbocation $C_6H_5-C^+H-C_2H_5$,stabilized by resonance and the $+I$ effect of the ethyl group.$(I)$ forms a primary benzylic carbocation $C_6H_5-C^+H_2$,stabilized by resonance.$(III)$ forms a primary alkyl carbocation $CH_3-C^+H_2$,which is the least stable.Therefore,the decreasing order of reactivity is $IV > II > I > III$.

Arrange the following compounds in decreasing order of their reactivity for hydrolysis reaction:
$(I)$ $C_6H_5-CH_2-Br$
$(II)$ $C_6H_5-CH(Br)-C_2H_5$
$(III)$ $CH_3-CH_2-Br$
$(IV)$ $C_6H_5-CH(Br)-C_6H_5$

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Arrange the following compounds in decreasing order of their reactivity for hydrolysis reaction:$(I)$ $C_6H_5-CH_2-Br$$(II)$ $C_6H_5-CH(Br)-C_2H_5$$(III)$ $CH_3-CH_2-Br$$(IV)$ $C_6H_5-CH(Br)-C_6H_5$