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Chapter: Halogen Derivatives
8th Lec.
What is Halogen Derivatives?

Action with ..

1) Ethyl Bromide React With Potassium Cyanide.

2) Ethyl Bromide React With Silver Cyanide .

By Anant Kausale

Dr.A.P.J.Abdul Kalam Sir Research Centre .

1) Ethyl bromide reacts with potassium cyanide (KCN), typically in an alcoholic or aqueous ethanol solution, to form ethyl cyanide (also known as propanenitrile, as the major product.

This is a nucleophilic substitution reaction (S_{N}2) mechanism) where the cyanide ion (CN^{-) replaces the bromide ion (Br^{-}).

Equation: (CH_{3}CH_{2}Br +KCN Give To ____ CH_{3}CH_{2}CN +KBr

Reagent: Alcoholic (KCN) (in aqueous ethanol).

Product: Ethyl cyanide (Propanenitrile)

Mechanism: (S_{N}2) (Nucleophilic substitution)
Side Product: A small amount of ethyl isocyanide (CH_{3}CH_{2}NC) may be formed, but ethyl cyanide is the major product.

2) When ethyl bromide reacts with silver cyanide (AgCN), it typically forms ethyl isocyanide and silver bromide (AgBr), due to the ambident nature of the cyanide ion and the preference for nitrogen attack with (AgCN), though some sources mention ethyl cyanide depending on conditions like solvent, but isocyanide is a common product in alcohol, says Filo.

Here's the reaction: (CH_{3}CH_{2}Br +AgCN ------------- CH_{3}CH_{2}NC + AgBr
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