Question

The common feature among the species ${CN}^{-},CO$ and ${NO}^{+}$ are:

• A. bond order three and isoelectronic
• B. bond order three and weak field ligands
• C. bond order two and $\pi$-acceptors
• D. isoelectronic and weak field ligands

Answer 1

The correct option is A bond order three and isoelectronic

Two or more molecular entities (atoms, molecules or ions) are described as being isoelectronic with each other if they have the same number of electrons or a similar electron configuration and the same structure (number and connectivity of atoms), regardless of the nature of the elements involved.

Bond order is the number of chemical bonds between a pair of atoms and indicates the stability of a bond.

$C{N}^{-}$ is a strong field ligand and has $6+7+1=14$ electrons.

${[C\equiv N]}^{-}$

$CO$ is a strong field ligand and has $6+8=14$ electrons

$N{O}^{+}$ is a strong field ligand and has $7+8-1=14$ electrons

All the ligands have bond order as $3$.