Question

Which of the following is a negative ligand ?

• A. thiocarbonyl
• B. carbonyl
• C. cyclopentadienyl
• D. nitroxyl.

Answer 1

Answer: (C)

cyclopentadienyl

Answer 2

Cyclopentadienyl is a negative ligand $(C_5H_5^-)$ while other ligands are neutral ligands.