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JEE Main 202125 JulyEvening Shift
Exam
JEE Main
Year
2021
Date
25 July
Shift
Evening Shift
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Main 2021 · 25 July · Evening Shift · Chemistry · Chemical Bonding and Molecular Structure

In the following the correct bond order sequence is:

In the following the correct bond order sequence is:

Options

  1. AO22−>O2+>O2−>O2{O}_{2}^{2 -} > {O}_{2}^{+} > {O}_{2}^{-} > {O}_{2}
  2. BO2+>O2−>O22−>O2{O}_{2}^{+} > {O}_{2}^{-} > {O}_{2}^{2 -} > {O}_{2}
  3. CO2+>O2>O2−>O22−{O}_{2}^{+} > {O}_{2} > {O}_{2}^{-} > {O}_{2}^{2 -}
  4. DO2>O2−>O22−>O2+{O}_{2} > {O}_{2}^{-} > {O}_{2}^{2 -} > {O}_{2}^{+}

Correct answer

C. O2+>O2>O2−>O22−{O}_{2}^{+} > {O}_{2} > {O}_{2}^{-} > {O}_{2}^{2 -}

Step-by-step solution

O2(16{O}_{2} ( 16 electrons)

σ1s2,σ1s∗2,σ2s2,σ2s∗2,σ2p22{\sigma}_{1s}^{2}, {\sigma}_{1s}^{* 2}, {\sigma}_{2s}^{2}, {\sigma}_{2s}^{* 2}, {\sigma}_{2{p}_{2}}^{2}

π2px2=π2py2,π2px∗1=π2py∗1,σ2pz∗{\pi}_{2{p}_{x}}^{2} = {\pi}_{2{p}_{y}}^{2}, {\pi}_{2{p}_{x}}^{{*}_{1}} = {\pi}_{2{p}_{y}}^{{*}_{1}}, {\sigma}_{2{p}_{z}}^{*}

Bond order of O2⇒2{O}_{2} ⇒ 2
Bond order of O2−⇒1.5{O}_{2}^{-} ⇒ 1 . 5
Bond order of O22−⇒1{O}_{2}^{2 -} ⇒ 1
Bond order of O2+⇒2.5{O}_{2}^{+} ⇒ 2 . 5

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