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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008520

In the following sequence of reaction, A and B are two unknown compounds. Identify them.

CH subscript 2 space equals space CH subscript 2 space rightwards arrow with Br subscript 2 on top space straight A space rightwards arrow from straight H subscript 3 straight O to the power of plus to alc. space KCN of straight B

Solution

A is 1,2 dibromoethane

B is 1,2 ethane 1,2 dicarboxylic