Multiple choice

Bond order of CO+ is ?

  1. 3 .

  2. 3.5 .

  3. 2.5 .

  4. 7.5 .
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B Correct answer
Explanation

this option is correct because , through  molecular orbital theory , we get the bond order of CO to be 3 . and the last electron lies  in the bonding molecual orbital but actually energy of sigma  antibonding 2s2  orbital is greater than that of sigma 2p orbital . hence the removal of electron takes place from  sigma  antibonding 2s2  orbital .  which increase the bond order to 3.5  which is calculated by the formula  1/2 (Nb- Na) , where Nb and Na are the number of electrons in bonding and anti - bonding orbitals respectively . 

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