143.
Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN form isocyanides as the chief product. Give reason.
In case of AgCN mainly covalent in nature thus, nitrogen is free to donate electron pair with haloalkanes and isocyanides is form as the chief product. On other hand KCN is ionic in nature which provides cyanide ions in solution. Both carbon and nitrogen atoms are on position to donate electron pairs, the attack takes place mainly through carbon atom not through nitrogen atom since C-C bond is more stable than C-N bond. Thus, cyanides from as main product.
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