Compound 'A' (molecular formula C3H8O)is...

Compound 'A' (molecular formula `C_3H_8O`)is treated with acidified potassium dichromate to form a product 'B' (molecular formula `C_3H_6O`).'B' forms a shining silver mirror on warming with ammoniacal silver nitrate. 'B'when treated with an aqueous solution of `H_2NCONHNH_2, HCl and `sodium acetate gives a product 'C'. Identify the structure of C :

`(CH_3)_2C = NNHCONH_2`

`(CH_3)_2C = NCONHNH_2`

`CH_3CH_2CH = NNHCONH_2`

`CH_3CH_2CH = NCONHNH_2`

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