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Question: Answered & Verified by Expert
According to "molecular orbital theory", which among the following diatomic molecules only has $\pi$-bonds?
ChemistryChemical Bonding and Molecular StructureAP EAMCETAP EAMCET 2021 (24 Aug Shift 2)
Options:
  • A $\mathrm{N}_2$
  • B $\mathrm{H}_2$
  • C $\mathrm{C}_2$
  • D $\mathrm{Be}_2$
Solution:
2296 Upvotes Verified Answer
The correct answer is: $\mathrm{C}_2$
Molecular orbital configuration of $\mathrm{C}_2$ is
$\sigma l s^2 \sigma * 1 s^2 \sigma 2 s^2 \sigma * 2 s^2 \pi 2 p_x^2=\pi 2 p_y^2$
So, $\mathrm{C}_2$ molecule contains only $\pi$-bonds.

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