The correct decreasing order of priority for the functional groups of organic compounds in the $IUPAC$ system of nomenclature is:

  • A
    $-COCl > -CONH_2 > -CHO > -OH$
  • B
    $-CONH_2 > -CHO > -COCl > -OH$
  • C
    $-COCl > -CHO > -CONH_2 > -OH$
  • D
    $-CHO > -CONH_2 > -COCl > -OH$

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