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Question

Chemistry Question on Chemical bonding and molecular structure

The bond order of O2+,O2,O22O_{2}^{+},\,\,{{O}_{2}},\,\,O_{2}^{2-} and O2O_{2}^{-} varies in the order:

A

O2+>O2>O22>O2O_{2}^{+}>{{O}_{2}}>O_{2}^{2-}>O_{2}^{-}

B

O22>O2>O2>O2+O_{2}^{2-}>O_{2}^{-}>{{O}_{2}}>O_{2}^{+}

C

O2+>O2>O2>O22O_{2}^{+}>{{O}_{2}}>O_{2}^{-}>O_{2}^{2-}

D

O2>O2+>O2>O22{{O}_{2}}>O_{2}^{+}>O_{2}^{-}>O_{2}^{2-}

Answer

O2+>O2>O2>O22O_{2}^{+}>{{O}_{2}}>O_{2}^{-}>O_{2}^{2-}

Explanation

Solution

Electronic configuration of O2+O _{2}^{+}: σ1s2,σ1s2,σ2s2,σ2s2,σ2px2,π2py2\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \sigma^{*} 2 s^{2}, \sigma 2 p_{x}^{2}, \pi 2 p_{y}^{2} =π2pz2,π2py1=π2pz0=\pi 2 p_{z}^{2}, \pi^{*} 2 p_{y}^{1}=\pi^{*} 2 p_{z}^{0} \therefore bond order of σ2+=12\sigma_{2}^{+}=\frac{1}{2} (bonding electron - antibonding electron) =12(105)=\frac{1}{2}(10-5) =12×5=2.5=\frac{1}{2} \times 5=2.5 Electronic configuration of O2+O _{2}^{+}: σ1s2,σ1s2,σ2s2,σ2s2,σ2px2,π2py2\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \sigma^{*} 2 s^{2}, \sigma 2 p_{x}^{2}, \pi 2 p_{y}^{2} =π2px2,π2py1=π2pz1=\pi 2 p_{x}^{2}, \pi * 2 p_{y}^{1}=\pi^{*} 2 p_{z}^{1} \therefore bond order of O2=12(106)O_{2}=\frac{1}{2}(10-6) =12×4=2=\frac{1}{2} \times 4=2 Electronic configuration of O22:O _{2}^{2-}: σ1s2,σ1s2,σ2s2,σ2s2,σ2px2,π2py2\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \sigma^{*} 2 s^{2}, \sigma 2 p_{x}^{2}, \pi 2 p_{y}^{2} π2pz2,π2py2=π2pz2 \pi 2 p_{z}^{2}, \pi^{*} 2 p_{y}^{2}=\pi^{*} 2 p_{z}^{2} \therefore bond order of O22=12(108)O _{2}^{2-}=\frac{1}{2}(10-8) =12×2=1=\frac{1}{2} \times 2=1 Electronic configuration of O2O _{2}^{-}: σ1s2,σ1s2,σ2s2,σ2s2,σ2px2,π2py2\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \sigma^{*} 2 s^{2}, \sigma 2 p_{x}^{2}, \pi 2 p_{y}^{2} =π2pz2,π2py2=π2pz1=\pi 2 p_{z}^{2}, \pi^{*} 2 p_{y}^{2}=\pi^{*} 2 p_{z}^{1} \therefore bond order of O2=12(107)O_{2}^{-}=\frac{1}{2}(10-7) =12×3=1.5=\frac{1}{2} \times 3=1.5 Hence, the bond order of O2+,O2,O22O _{2}^{+}, O _{2}, O _{2}^{2-} and O2O _{2}^{-} varies in the order : O2+>O2>O2>O22O _{2}^{+}> O _{2}> O _{2}^{-}> O _{2}^{2-}