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JEE Main · 2021 · 25 Jul 2021 · Shift 2 · Chemical Bonding and Molecular Structure

In the following the correct bond order sequence is:

(A) $O_{2} > O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+}$
(B) $O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}$ ✓ Correct
(C) $O_{2}^{2 -} > O_{2}^{+} > O_{2}^{-} > O_{2}$
(D) $O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -} > O_{2}$

Answer: (B)

Solution

Bond orders:

O_{2}^{+} = 2.5

,

O_{2} = 2.0

,

O_{2}^{-} = 1.5

,

O_{2}^{2 -} = 1.0

. The decreasing sequence is

O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}

.

JEE Main · 2021 · 25 Jul 2021 · Shift 2 · Single correct option

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