Vsepr & Hybridisation
The geometry around carbon in CH2=CH2 (ethene) is:
Select the correct option:
Solution
Trigonal planar (~120°)
- Structure: H2C=CH2. Each Carbon atom forms 3 σ bonds (2 with H, 1 with C) and 1 π bond.
- Steric Number: Since π bonds do not contribute to geometry, the steric number is 3 (3 σ bonds).
- Hybridisation: Carbon is sp2 hybridised.
- Geometry: The three sp2 hybrid orbitals are directed toward the corners of an equilateral triangle to minimize repulsion.
- Bond Angle: This results in a trigonal planar arrangement with bond angles of approximately 120∘.
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- vsepr & hybridisation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Trigonal planar (~120°)
- Structure: H2C=CH2. Each Carbon atom forms 3 σ bonds (2 with H, 1 with C) and 1 π bond.
- Steric Number: Since π bonds do not contribute to geometry, the steric number is 3 (3 σ bonds).
- Hybridisation: Carbon is sp2 hybridised.
- Geometry: The three sp2 hybrid orbitals are directed toward the corners of an equilateral triangle to minimize repulsion.
- Bond Angle: This results in a trigonal planar arrangement with bond angles of approximately 120∘.
This easy 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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