Question

The common features among $CO ,\, CN ^{-}$ and $NO _{2}^{+}$ are

• A. Bond order three and isoelectronic
• B. Bond order three and weak-field ligands
• C. Bond order two and $\pi$-acceptor
• D. Bond order three and $\pi$ -donors
• E. Isoelectronic and strong field ligands

Answer 1

Answer: (A)

For the species having same number of electrons, have same bond order.

Number of electrons for $CO =6+8=14$

Number of electrons for $CN ^{-}=6+7+1=14$

Number of electrons from $NO ^{+}=7+8-1=14$

Hence, all the given species are iso-electronic and have same bond-order (three)