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hat is difference of machenism of R-X with KCN and R-X with AgCN?
Dear vikash,
In presence of alcoholic KCN alkyl halides gives gives alkyl cyanides. But in presence of AgCN (alcoholic) we get the formation of alkyl isocyanide.
C2H5Br + KCN -----> C2H5CN + KBr
C2H5Br + AgCN -------> C2H5NC + AgBr
CN- being an ambidient nucleophile and the Ag--C bond being very strong does not cleave readily and so the isocyanide is formed. But the K-C bond being ionic cleaves readily to give the nitrile.
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