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According to Molecular Orbital Theory, which of the following statements is correct?

1. The bond order of N2 molecule is 2.5
2. In the C2 molecule, both bonds present are pi bonds
3. In the C2²- ion, there is one sigma bond and two pi bonds
4. All of the above statements are correct

Correct answer: In the C2 molecule, both bonds present are pi bonds

Solution

N2 has bond order 3 (not 2.5), so option A is wrong. C2 has the configuration where the two highest occupied MOs are both pi2p orbitals, making both bonds pi bonds — option B is correct. Since A is wrong, D is also wrong.

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