Which one of the following molecules is not planar?
Correct answer: B. Phosphorus trichloride.
- A. Benzene.
- B. Phosphorus trichloride.
- C. Ethene.
- D. Boron trifluoride.
Explanation
The correct answer is Phosphorus trichloride (PCl3) because it has a trigonal pyramidal geometry, which results from the lone pair on the phosphorus atom causing a deviation from planarity. In contrast, Benzene, Ethene, and Boron trifluoride are all planar molecules. Benzene has a hexagonal planar ring, Ethene has a planar double-bonded structure, and Boron trifluoride has a trigonal planar arrangement.
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