Among the following, the strongest nucleophile is

C_{2} H_{5} S^{-}

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C H_{3} C O O^{-}

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C H_{3} N H_{2}

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N C C H_{2} O^{-}

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Solution

The correct option is A $C_{2} H_{5} S^{-}$
Nucleophiles are those substances which can donate a pair of electrons. These can be neutral or negative. The nucleophilic power depends on the tendency of species to donate electrons. This is more, when an electron pushing group ( $+ I$ or, $+ M$ group) is present and negative charge is on less electronegative atom so that electron pair is easily pushed.
Here, negative charge on less electronegative atom- $S$ with electron releasing group ( $C_{2} H_{5}$ ) is most nucleophilic in nature.
Hence, (a) is correct.

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