Answer: C-H sigma bond into an adjacent empty or pi orbital.
- A C-H sigma bond into an adjacent empty or pi orbital
- B A lone pair delocalising directly into an adjacent sigma bond
- C A filled pi bond delocalising into an adjacent sigma* orbital
- D Two separate lone pairs delocalising into each other
Correct answer: A. C-H sigma bond into an adjacent empty or pi orbital
Explanation: Hyperconjugation (no-bond resonance) occurs when electrons in a C-H sigma bond are delocalised into an adjacent vacant or pi orbital.
VSEPR theory predicts molecular shape from the number of bonding and lone electron pairs around the central atom.
Concept context
Understand how atoms join to form molecules. Covers ionic and covalent bonding, VSEPR theory, hybridization (sp, sp², sp³), molecular orbital theory, bond polarity, and intermolecular forces like hydrogen bonding.
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