Question

Which of the following is strongest nucleophile

• A. $Br^{-}$
• B. $: OH^{-}$
• C. $: CN^{-}$
• D. $C_2 H_5 \bar{O}$

Answer 1

Answer: (C)

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