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(D) The reactivity of nucleophilic substitution depends on the leaving group ability.$(I)$ Triflate $(-OSO_2CF_3)$ is an excellent leaving group due t

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$I, II, IV, III$

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(D) The reactivity of nucleophilic substitution depends on the leaving group ability.$(I)$ Triflate $(-OSO_2CF_3)$ is an excellent leaving group due to the strong electron-withdrawing effect of the $CF_3$ group.$(II)$ Tosylate $(-OTs)$ is a good leaving group but less effective than triflate.$(III)$ and $(IV)$ contain $-OH$ groups,which are poor leaving groups. However,in the presence of an acid catalyst,they can undergo substitution. Between $(III)$ and $(IV)$,$(IV)$ is more reactive because it forms a resonance-stabilized benzylic carbocation $(C_6H_5-CH^+-CH_3)$,whereas $(III)$ forms a secondary carbocation $(CH_3-CH^+-CH_3)$.Thus,the decreasing order of reactivity is $I > II > IV > III$.

Arrange the following compounds in decreasing order of reactivity for nucleophilic substitution reaction:
$(I)$ $CH_3-CH_2-OSO_2CF_3$
$(II)$ $CH_3-CH_2-OTs$
$(III)$ $CH_3-CH(OH)-CH_3$
$(IV)$ $C_6H_5-CH(OH)-CH_3$

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Arrange the following compounds in decreasing order of reactivity for nucleophilic substitution reaction:$(I)$ $CH_3-CH_2-OSO_2CF_3$$(II)$ $CH_3-CH_2-OTs$$(III)$ $CH_3-CH(OH)-CH_3$$(IV)$ $C_6H_5-CH(OH)-CH_3$