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Which of the following diatomic molecular species has only π-bonds according to Molecular Orbital Theory?

1. O2
2. N2
3. C2
4. Be2

Correct answer: C2

Solution

According to Molecular Orbital Theory, C2 has only π-bonds because its molecular orbital configuration places all valence electrons in π-bonding orbitals, with no electrons in σ-bonding orbitals.

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