The reagent used for converting acetylene to oxalic acid is

  • A
    $HgSO_4 / \text{aqueous } H_2SO_4$
  • B
    $HgSO_4 / CH_3COOH$
  • C
    $KMnO_4 / KOH, 25^{\circ}C$
  • D
    $Cr_2O_3 / H_2SO_4$

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