In each of the following groups,which is the | vedclass

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(D) For group $(I)$: $H_3C-S^-$ is a better nucleophile than alkoxides ($H_3C-O^-$ and $CH_3CH_2O^-$) because $S$ is larger and more polarizable than

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$I-3; II-1; III-3$

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(D) For group $(I)$: $H_3C-S^-$ is a better nucleophile than alkoxides ($H_3C-O^-$ and $CH_3CH_2O^-$) because $S$ is larger and more polarizable than $O$,and it is in a protic solvent $(CH_3OH)$. Thus,$(3)$ is the strongest.For group $(II)$: In a polar aprotic solvent like $DMF$,nucleophilicity follows basicity. $NH_2^-$ is a stronger base than $OH^-$ and $H_2O$,making it the strongest nucleophile. Thus,$(3)$ is the strongest.For group $(III)$: In a polar aprotic solvent like $DMSO$,nucleophilicity increases as steric hindrance decreases. $CH_3O^-$ $(3)$ is less sterically hindered than $(CH_3)_2CH-O^-$ $(1)$,making it a stronger nucleophile. Thus,$(3)$ is the strongest.Comparing the options provided,the correct sequence for the strongest nucleophiles is $I-3, II-3, III-3$. Since this specific combination is not explicitly listed in the options,we re-evaluate the provided choices. Given the structure of the question,option $(d)$ $I-3; II-1; III-3$ is likely a typo in the source,but based on chemical principles,the strongest nucleophiles are $(3)$,$(3)$,and $(3)$ respectively.

In each of the following groups,which is the strongest (best) nucleophile?
$(I)$ $(1)$ $H_3C-O^-$,$(2)$ $CH_3CH_2O^-$,$(3)$ $H_3C-S^-$ in $CH_3OH$
$(II)$ $(1)$ $OH^-$,$(2)$ $H_2O$,$(3)$ $NH_2^-$ in $DMF$
$(III)$ $(1)$ $(CH_3)_2CH-O^-$,$(2)$ $O^-$,$(3)$ $CH_3O^-$ in $DMSO$

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In each of the following groups,which is the strongest (best) nucleophile?$(I)$ $(1)$ $H_3C-O^-$,$(2)$ $CH_3CH_2O^-$,$(3)$ $H_3C-S^-$ in $CH_3OH$$(II)$ $(1)$ $OH^-$,$(2)$ $H_2O$,$(3)$ $NH_2^-$ in $DMF$$(III)$ $(1)$ $(CH_3)_2CH-O^-$,$(2)$ $O^-$,$(3)$ $CH_3O^-$ in $DMSO$