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Question: Answered & Verified by Expert
Which one of the following molecules contain no $\pi$-bond?
ChemistryChemical Bonding and Molecular StructureNEETNEET 2013 (All India)
Options:
  • A $\mathrm{CO}_2$
  • B $\mathrm{H}_2 \mathrm{O}$
  • C $\mathrm{SO}_2$
  • D $\mathrm{NO}_2$
Solution:
1700 Upvotes Verified Answer
The correct answer is: $\mathrm{H}_2 \mathrm{O}$
All the molecules have $\mathrm{O}$ atom with lone pairs, but in $\mathrm{H}_2 \mathrm{O}$ the $\mathrm{H}$ atom has no vacant orbital for $\pi$ bonding. That's why it does not have any $\pi$ bond.
In all other given molecules, the central atom because of the presence of vacant orbitals is capable to farm $\pi$ bonds.

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