Question

Which of the following is common features among the species $C{N}^{-}$, $CO$ and $N{O}^{+}$?

• A. Bond order is three and are iso-electronic species.
• B. Bond order is two and are $\pi$ - acceptors.
• C. Bond order is three and are weak field ligands
• D. These are iso-electronic species and are weak field ligands.

Answer 1

Answer: (A)

Bond order is three and are iso-electronic species.

The ions and molecules $C{N}^{-},CO$ and $N{O}^{+}$ are isoelectronic. Each species has 14 electrons and bond order for each is three .

Hence, they have identical bond orders i.e., three as one sigma and two pi bonds are present in each ion/molecule.

All the electrons are paired. Hence, they are diamagnetic.

They are strong field and $\pi$-acceptor ligands.