Which one of the following species will have maximum bond dissociation energy?

Which one of the following species will have maximum bond dissociation energy?

  1. A

    C2

  2. B

    C2+

  3. C

    C2

  4. D

    C22

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    Solution:

    C2  (8 electrons); KK(σ2s)2(σ2s)2π2px2π2py2 Bond order =(62)/2=2

    C2+ (7 electrons);  Bond order =(52)/2=11/2

    C2 (9 electrons);  KK(σ2s)2(σ2s)2π2px2π2py2σ2py1 Bond order =(72)/2=212

    C22 -(10 electrons);   Bond order =(82)/2=3

    Larger the bond order, larger the dissociation energy.

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