Cyanide ion acts as an ambiant nucleophile.From which end it acts as a stronger nuclephile in aquaous medium.

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Solution

$C y a n i d e i o n i s a n a m b i d e n t a t e i o n . i . e ., i t a c t s a s C N^{-} a n d N C^{-} I n a q u e o u s s o l u t i o n C N^{-} i s a s t r o n g e r n u c l e o p h i l e b e c a u s e h e r e t h e c a r b o n e n d l e a d s t o t h e f o r m a t i o n o f s t a b l e C - C b o n d, w h e r e a s t h e C - N b o n d i s l e s s s t a b l e . A n o t h e r r e a s o n i s C N^{-} i s a s t r o n g n u c l e o p h i l e a n d s t r o n g b a s e b e c u a s e i t s c o n j u c a t e a c i d (H C N) i s a w e a k a c i d .$

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