Vsepr & Hybridisation
Number of σ and π bonds respectively in benzene (C6H6) are:
Select the correct option:
Solution
12 σ, 3 π
- Structure of Benzene: A planar hexagonal ring of 6 Carbon atoms with one Hydrogen attached to each.
- Calculation of σ bonds:
- C–C σ bonds: 6 bonds forming the ring.
- C–H σ bonds: 6 bonds extending outwards.
- Total σ = 6+6=12.
- Calculation of π bonds:
- The ring has 3 alternating double bonds in the Kekulé representation.
- Total π = 3.
- MO Context: While the π electrons are delocalized, they originate from the overlap of 6 p-orbitals to form 3 occupied bonding π-MOs, consistent with a σ12π3 description.
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- vsepr & hybridisation
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
12 σ, 3 π
- Structure of Benzene: A planar hexagonal ring of 6 Carbon atoms with one Hydrogen attached to each.
- Calculation of σ bonds:
- C–C σ bonds: 6 bonds forming the ring.
- C–H σ bonds: 6 bonds extending outwards.
- Total σ = 6+6=12.
- Calculation of π bonds:
- The ring has 3 alternating double bonds in the Kekulé representation.
- Total π = 3.
- MO Context: While the π electrons are delocalized, they originate from the overlap of 6 p-orbitals to form 3 occupied bonding π-MOs, consistent with a σ12π3 description.
This medium difficulty chemistry question is from the chapter chemical bonding and molecular structure, covering the topic of vsepr & hybridisation. It appeared in the 2025 exam.
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