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Question: Answered & Verified by Expert
In oxygen and carbon molecule the bonding is
ChemistryChemical Bonding and Molecular StructureKCETKCET 2022
Options:
  • A $\mathrm{O}_2: 2 \sigma, 0 \pi ; \mathrm{C}_2: 0 \sigma, 2 \pi$
  • B $\mathrm{O}_2: 1 \sigma, 1 \pi ; \mathrm{C}_2: 0 \sigma, 2 \pi$
  • C $\mathrm{O}_2: 0 \sigma, 2 \pi ; \mathrm{C}_2: 2 \sigma, 0 \pi$
  • D $\mathrm{O}_2: 1 \sigma, 1 \pi ; \mathrm{C}_2: 1 \sigma, 1 \pi$
Solution:
2593 Upvotes Verified Answer
The correct answer is: $\mathrm{O}_2: 1 \sigma, 1 \pi ; \mathrm{C}_2: 0 \sigma, 2 \pi$
The bond order of $\mathrm{C}_2$ consists of both pi bond because of the presence of the four electrons in two pi molecular orbitals. Whereas in most of the other molecules a double bond is made up of a sigma bond and a pi bond.
Thus, option (b) is correct.

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