Answer: BF 3.
- A NH<sub>3</sub>
- B BF<sub>3</sub>
- C H<sub>2</sub>O
- D HCl
Correct answer: B. BF<sub>3</sub>
Explanation: BF<sub>3</sub> is trigonal planar and symmetric, so the three bond dipoles cancel, giving a net dipole moment of zero.
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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