A) \[B{{r}^{-}}\]
B) \[:O{{H}^{-}}\]
C) \[:C{{N}^{-}}\]
D) \[{{C}_{2}}{{H}_{5}}\bar{O}:\]
Correct Answer: C
Solution :
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: \[C{{N}^{-}}>{{I}^{-}}>{{C}_{6}}{{H}_{5}}{{O}^{-}}>O{{H}^{-}}>B{{r}^{-}}>C{{l}^{-}}\]
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