JEE Main · 2021 · Shift-IIeasyBOND-112

In the following, the correct bond order sequence is:

Chemical Bonding · Class 11 · JEE Main Previous Year Question

Question

In the following, the correct bond order sequence is:

Options

a
$\mathrm{O_2^{2-} > O_2^+ > O_2^- > O_2}$
b
$\mathrm{O_2^+ > O_2^- > O_2^{2-} > O_2}$
c
$\mathrm{O_2^+ > O_2 > O_2^- > O_2^{2-}}$
✓
d
$\mathrm{O_2 > O_2^- > O_2^{2-} > O_2^+}$

Correct Answerc

$\mathrm{O_2^+ > O_2 > O_2^- > O_2^{2-}}$

Detailed Solution

🧠 Bond order is proportional to bond strength. For the oxygen species, every additional electron enters an antibonding $\pi^*$ orbital.

| Species | e | BO | |---|---|---| | $\ce{O2+}$ | 15 | 2.5 | | $\ce{O2}$ | 16 | 2 | | $\ce{O2-}$ | 17 | 1.5 | | $\ce{O2^{2-}}$ | 18 | 1 |

Decreasing bond order: $\ce{O2+ > O2 > O2^- > O2^{2-}}$

$\boxed{\text{Answer: (c) } \ce{O2^+ > O2 > O2^- > O2^{2-}}}$

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