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Chemistry Question on reaction mechanism

Which of the following is strongest nucleophile

A

Br−Br^{-}

B

:OH−: OH^{-}

C

:CN−: CN^{-}

D

C2H5OˉC_2 H_5 \bar{O}

Answer

:CN−: CN^{-}

Explanation

Solution

The strength of nucleophile depends upon the nature of alkyl group RR on which nucleophile has to attack and also on the nature of solvent. The order of strength of nucleophiles follows the order :
CN−>I−>C6H5O−>OH−>Br−>Cl−CN^{-} > I^{-} > C_6H_5O^{-} > OH^{-} > Br^{-} > Cl^{-}