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,and $B$ when treated with an aqueous solution of $NH_2NHCONH_2$ and sodium acetate gives a product $C$. Identify the structure of $C$.

  • A
    $CH_3CH_2CH=NNHCONH_2$
  • B
    $CH_3C(CH_3)=NNHCONH_2$
  • C
    $CH_3C(CH_3)=NCONHNH_2$
  • D
    $CH_3CH_2CH=NCONHNH_2$

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