Malonic acid can be prepared from acetic acid using which combination of chemicals in the proper sequence?

  • A
    $HCN, H_3O^{+}$
  • B
    $Br_2 - \text{Red } P, KCN, H_3O^{+}$
  • C
    $NaCN, H_3O^{+}$
  • D
    $HOCl, KCN, H_3O^{+}$

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