Question

89. How many electrons are present in antibonding MO's in CN* ion?​

Answer 1

Explanation:

Remember that two bonding electrons make one bond, while 2 antibonding electrons make an antibond, and one antibond cancels one bond.

Thus CN+ will have 6 bonding electrons and 6 antibonding electrons.

Answer 2

There are four electrons present in antibonding MO's in CN* ion

Explanation:

• Configuration of CN+ ion is σ$1s^{2}$,σ∗$1s^{2}$  σ2s2 σ*2s2 .
• The total number of electrons of CN- ion is ( 6+7+1) = 14
• the number of bonding electrons is 10 and the number of the antibonding electron is 4.
• The bond order for CN- is 3. There is a triple bond between the C atom and the N atom C≡N
• Thus, 4 electrons are present in the antibonding molecular orbital.  

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