Which ligand name is paired correctly with its formula according to the current IUPAC recommendations?

A $CN X^{-}$ : cyano
B $H X_{2} O$ : aquo
C $Cl X^{-}$ : chloro
D $CO$ : carbonyl

Answer: D

Current IUPAC names are chlorido, cyanido and aqua for chloride, cyanide and water, so the other three pairs use old names. Neutral CO is named carbonyl, which is unchanged.

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