According to MO theory the bond orders for $\mathrm{O}_{2}^{2-}$, CO and $\mathrm{NO}^{+}$ respectively, are

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Chemical Bonding and Molecular Structure

According to MO theory the bond orders for

O_{2}^{2 -}

, CO and

NO^{+}

respectively, are

Answer: (A)

The peroxide ion

O X_{2} X^{2 -}

carries eighteen electrons, with ten in bonding and eight in antibonding molecular orbitals, giving a bond order of

\frac{1}{2} (10 - 8) = 1

. Carbon monoxide has fourteen electrons, ten bonding and four antibonding, so its bond order is

\frac{1}{2} (10 - 4) = 3

. The nitrosonium ion

NO X^{+}

is isoelectronic with carbon monoxide, also fourteen electrons, giving a bond order of

3

. The bond orders are thus

1

3

and

3

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Single correct option