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Question

Which of the following options represents the correct bond order? 
  1. O2<O2>O+2
  2. O2>O2>O+2
  3. O2<O2<O+2
  4. O2>O2<O+2


Solution

The correct option is C O2<O2<O+2
Bond Order=Bonding electronsAntibonding electrons2

O2 Total electron = 8 + 9 = 17
Configuration:
σ(1s)2σ(1s)2σ(2s)2σ(2s)2σ(2pz)2π(2px)2π(2py)2π(2px)2π(2py)1
Bond Order=1072=1.5

O2 Total electron = 8 + 8 = 16
Configuration:
σ(1s)2σ(1s)2σ(2s)2σ(2s)2σ(2pz)2π(2px)2π(2py)2π(2px)1π(2py)1
Bond Order=1062=2

O+2 Total electron = 8 + 7 = 15
Configuration:
σ(1s)2σ(1s)2σ(2s)2σ(2s)2σ(2pz)2π(2px)2π(2py)2π(2px)1
Bond Order=1052=2.5

Hence, the correct bond order in the following species is:
O+2>O2>O2. 

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