Which of the following is not a nucleophile?

C N^{-}

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N H_{3}

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B F_{3}

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O H^{-}

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Solution

The correct option is C $B F_{3}$
A reagent which donates an electron pair to an electron deficient centre is called as a nucleophile.
$N H_{3}, O H^{-}, C N^{-}$ can donate electron pair, thus they are nucleophiles while $B F_{3}$ can only accept an electron pair in its vacant p-orpital and thus it acts as an electrophile.
Illustration for Nucleophile and Electrophile:

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