Alkyl halides reacts with kcn gives cyanides whereas with agcn gives isocyanides. what is the reason
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CN- is an ambient nucleophile i.e. it can form bond from both C and N atoms. KCN is an ionic compound so both C and N sides are available for the formation of bond, but C-C bond is stronger than C-N bond so cynide is formed. AgCN is a covalent compound so only N side is available for CN to form bond and thus isocynide is formed.
Hope it helps!
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