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Compound 'X' (C(3)H(8)O) is treated with...

Compound 'X' `(C_(3)H_(8)O)` is treated with acidified `K_(2)Cr_(2)O_(7)` to form product 'Y' `(C_(3)H_(6)O)` 'Y' does not form silver mirror with ammoniacal `AgNO_(3)` but when treated with semicarbazide in feebly acidic medium gives:

A

`CH_(3)-underset(CH_(3))underset(|)(C)=N-NH-CO-NH_(2)`

B

`CH_(3)-underset(CH_(3))underset(|)(C)=N-CO-NH-NH_(2)`

C

`CH_(3)-CH_(2)-CH=N-NH-CO-NH_(2)`

D

`CH_(3)-CH_(2)-CH=N-CO-NH-NH_(2)`

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