Identify the reagent used in the following conversion.

  • A
    $CO, HCl / AlCl_3$
  • B
    $CrO_2 Cl_2 \cdot H_3 O^{+}$
  • C
    $AlH(i-Bu)_2, H_3 O^{+}$
  • D
    $CrO_3, (CH_3 CO)_2 O$

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