Question

The common features among the species $C{N}^{-},CO$ and $N{O}^{+}$ are:

• A. Bond order three and diamagnetic
• 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 diamagnetic

$C{N}^{-}:$ $14$ electrons (carbon - $6$, nitrogen - $7$, add $1$ for negative charge) and bond order is $3$ because of three covalent bonds between the atoms.

$CO:$ $14$ (carbon - $6$, oxygen - $8$) and bond order is $3$ because of three covalent bonds between the atoms..

$N{O}^{+}:$ $14$ (nitrogen - $7$, oxygen - $8$ and subtract $1$ for positive charge) and bond order is $3$ because of three covalent bonds between the atoms.

14 electrons system like $N_2$ will have diamagnetic character.