Which is the IUPAC group prefix of acyl halide compounds?

Correct option is D

The IUPAC group prefix for acyl halide compounds is "halocarbonyl."
 Alkoxycarbonyl: Refers to esters, not acyl halides.
 Carbamoyl: Related to urea derivatives, not acyl halides.
 Cyano: Represents nitriles, which contain a carbon triple-bonded to a nitrogen atom, unrelated to acyl halides.