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vikash chandola Grade:
        

hat is difference of machenism of R-X with KCN and R-X with AgCN?

6 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

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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Sagar Singh


B.Tech IIT Delhi


sagarsingh24.iitd@gmail.com


6 years ago
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