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How is bromoethane converted to ethyl carbylamine?

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Hint: Bromoethane also known as ethyl bromide is a chemical compound from the halo alkane group. The reagent used here has to be a cyanide so that it can substitute the bromine group.

Complete answer:
While doing the question which involves conversion between two compounds it is important to use an appropriate reagent.
For the conversion of bromoethane to ethyl carbylamine, bromoethane reacts with silver cyanide that is AgCN. We know that silver cyanide is a covalent compound hence Ag restricts carbon to show nucleophilic activity as it is bonded covalently with Ag.
So the less nucleophilic nitrogen atom as compared to carbon, the lone pair attacks the halogen holding the carbon is bromoethane. As a result of this the nitrogen carbon bond is formed and the product formed is ethyl carbylamine.
The reaction involved is shown below:
\[C{{H}_{3}}C{{H}_{2}}Br\xrightarrow{AgCN}C{{H}_{3}}C{{H}_{2}}NC\]

Additional information:
Uses of bromoethane:
Bromoethane or ethyl bromide is used as a solvent. It is also used as an anesthetic in medicines, in the refrigerants and as a fumigant.
Bromoethane is an ethylating agent in the organic synthesis and it is also used in gasoline.
Uses of ethyl carbylamine:
Ethyl carbylamine is generally used for the production of secondary amines.

Note:
Silver cyanide is the chemical compound having the chemical formulae of AgCN. Silver cyanide is a white solid which precipitates when treated with solutions. Silver cyanide is generally used in silver plating. The molecular weight of silver cyanide is around 133.88 g/mol and it is odorless.