Q 1252623534.     `A` mixture of two isomeric carboxylic acids can't be separated by general methods. However, when this given mixture is treated with optically active quinine, it forms two isomeric salts `X` and `Y.` The two salts are separated by fractional crystallisation and separately acidified with hydrochloric acid to form amine and carboxylic acids.

The compounds `A` and `B` can be respectively

A

Succinic acid and methylmalonic acid

B

Maleic and fumaric acids

C

Maleic and fumaric acids

D

Any of the above

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