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(D) The leaving group ability is directly proportional to the stability of the conjugate base formed after the leaving group departs.More stable conju

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$iv > i > ii > iii$

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(D) The leaving group ability is directly proportional to the stability of the conjugate base formed after the leaving group departs.More stable conjugate bases are weaker bases,and weaker bases are better leaving groups.$(i)$ The conjugate base is the tosylate ion,which is stabilized by resonance with two sulfonyl oxygen atoms.(ii) The conjugate base is the acetate ion,which is stabilized by resonance with one carbonyl oxygen atom.(iii) The conjugate base is the methoxide ion $(CH_3O^-)$,which is a strong base and a poor leaving group.(iv) The conjugate base is the triflate ion,which is highly stabilized by resonance and the strong electron-withdrawing effect of the $-CF_3$ group.Comparing the stability of the conjugate bases:Triflate $(iv)$ > Tosylate $(i)$ > Acetate $(ii)$ > Methoxide $(iii)$.Therefore,the order of leaving group ability is $(iv) > (i) > (ii) > (iii)$.

Rank the following groups in order of decreasing leaving group ability:
$(i)$ $-OSO_2C_6H_4CH_3$ (tosylate)
(ii) $-OCOCH_3$ (acetate)
(iii) $-OCH_3$ (methoxide)
(iv) $-OSO_2CF_3$ (triflate)

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Rank the following groups in order of decreasing leaving group ability:$(i)$ $-OSO_2C_6H_4CH_3$ (tosylate)(ii) $-OCOCH_3$ (acetate)(iii) $-OCH_3$ (methoxide)(iv) $-OSO_2CF_3$ (triflate)