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Which of the following gives the correct increasing order of bond order?

1. NO < C2 < O2 < He2+
2. C2 < NO < He2+ < O2
3. He2+ < O2- < NO < C2
4. He2+ < O2- < C2 < NO

Correct answer: He2+ < O2- < C2 < NO

Solution

Bond orders: He2+: (2-1)/2=0.5; O2-: for 17e-, filling gives bond order=(10-7)/2=1.5; C2: (8-4)/2=2; NO: (8-3)/2=2.5. Order: He2+(0.5) < O2-(1.5) < C2(2) < NO(2.5).

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