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Haloalkanes And Haloarenes

Question
CBSEENCH12007707

Identify the products A, B and C in the following:
straight C subscript 2 straight H subscript 5 straight I space rightwards arrow with alc. space KOH on top space straight A space rightwards arrow with Br subscript 2 on top space straight B space rightwards arrow with KCN on top space straight C

Solution

When ethyl iodide is treated with alc. KOH. It gives ethene which reacting with bromine gives 1,2 dibromoethane and further reacting with KCN gives ethlene dicyanide.
straight C subscript 2 straight H subscript 5 straight I space rightwards arrow with alc. space KOH on top space CH subscript 2 equals CH subscript 2 space space rightwards arrow with Br subscript 2 on top space space space C H subscript 2 B r minus C H subscript 2 B r space rightwards arrow with KCN on top space space C H subscript 2 C N minus C H subscript 2 C N