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What are the bond order and magnetic character of the CN⁻ ion?

1. 3, diamagnetic
2. 2 and 1/2, paramagnetic
3. 3, paramagnetic
4. 2 and 1/2, diamagnetic

Correct answer: 3, diamagnetic

Solution

CN⁻ has 10 electrons (same as N2); the MO configuration gives 8 bonding and 2 antibonding electrons, so bond order = (8-2)/2 = 3, with all electrons paired, making it diamagnetic.

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