Question

Which one of the following has the highest Nucleophilicity ?

• A. $F^{-}$
• B. $O{H}^{-}$
• C. $C{H}_3^{-}$
• D. $N{H}_2^{-}$

Answer 1

Answer: (C)

As nucleophilicity decreases as we move from left to right in the period, means small anions of the same nature and period (i.e. hydride anions and $F^{-}$ ) have order of nucleophilic nature:

$F<O<N<C$

Hence, $C{H}_3^{-}$ has highest nucleophilicity.