JEE Main · 2008 · 27 Apr 2008 · Offline · Chemical Bonding and Molecular Structure

Which one of the following pairs of species have the same bond order?

(A) $CN^{-}$ and $NO^{+}$ ✓ Correct
(B) $CN^{-}$ and $CN^{+}$
(C) $O_{2}^{-}$ and $CN^{-}$
(D) $NO^{+}$ and $CN^{+}$

Answer: (A)

Solution

Counting electrons,

C N^{-}

and

N O^{+}

each have fourteen and are isoelectronic with carbon monoxide and nitrogen, filling the molecular orbitals in the same way. Both therefore have a bond order of three, a triple bond, so this is the pair that shares the same bond order.

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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