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Compounds A and B are isomers with formu...

Compounds A and B are isomers with formula `C_2 H_4 Cl_2`. On treatment with aq. KOH, A gives a compound C which liberates ' H_2' gas on treatment with Na metal, B on treatment with aq.NaOH produces D which answers iodoform test. Give the structures of A,B,C and D and write the chemistry of reactions.

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