Discussion
Which of the following molecule has double bond with two π bonds?
Answer: D
The molecule is C2.
In the molecular orbital picture, C2 has 12 electrons, and its bonding electrons occupy the two π2p orbitals (π2px2 π2py2) with no electrons in σ2p. Its bond order is 2, and both bonds are π bonds, an unusual double bond with no σ component.
O2 also has bond order 2, but as one σ and one π bond. B2 and Li2 have bond order 1, and Ne2 has bond order 0 and does not exist as a stable molecule.
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