Among the following the strongest nucleophile is:

C_{2} H_{5} S H

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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}^{-}

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Solution

The correct option is A $C_{2} H_{5} S H$
In case of $C H_{3} C O O^{-}$ and $N C C H_{2}^{-}$ negative charge is involved in conjugation so less available for donation. While in case of $C_{2} H_{5} S H$ and $C H_{3} N H_{2}$ both nitrogen and sulphur have lone pairs but sulphur is less electronegative than nitrogen hence sluphur lone pairs are more available for more donation. So $C_{2} H_{5} S H$ is strongest nucleophile.

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