Question

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Answer 1

Hey bro here's your answer in potassium cyanide the bond present between them is purely ionic and hence break as K+ and CN- and hence carbon forms bonds with the alkyl halide but in Ag Cyanide the bond between carbon and silver is covalent and hence carbon is unable to form bonds with the alkyl halide so nitrogen forms the bonds forming isocyanide
hope it helps you bro and good morning

Answer 2

PLEASE TYPE THE QUESTION DIRECTLY MUCH AS POSSIBLE :
Q:
Haloalkenes react with KCN to form alkyl cyanide (like CH3CN)as their main product while AgCN forms isocyanides (like CH3NC).
Explain?


We know that,
#Haloalkenes react with KCN to form alkyl cyanide (like CH3CN)as their main product while AgCN forms isocyanides (like CH3NC).

# In nitriles, C of alkyl is bonded with C of CN whereas in isocyanides, C of alkyl is bonded with N of NC.

Reason :
=>
We know that, CN-is ambident nucleophile i. e. it can form bond from both C and N atoms .

=> By Fajans rule, KCN is predominantly more ionic than AgCN such that it gives ions in solution , so both C and N sides are available for the formation of bond.

=> But , we know that in reaction formation of stronger bond is favoured than weaker bond.
Same happens in this case .
=>Here in KCN , since it is ionic, we have we have two options ,First alkyl can make bond with CN to form C-C bond or it can make C-N bond.
Although, C-C bond is stronger than C-N bond.
So, Cyanide will be formed .



Now, in AgCN
=> AgCN is a predominantly covalent than KCN, so only N side is available for CN to form bond and thus isocyanide is formed.

Here, only N is free for bond formation.