A Levels Chemistry (9701)•9701/13/M/J/21
Explanation
Evaluating structural features of the brominated flame retardant molecule
Steps:
- Inspect brominated carbons: Each has four different substituents (C, Br, H, and another group), satisfying chirality criteria.
- Count atoms in diagram: Reveals 4 C, 1 H, and 1 Br, confirming formula C4HBr.
- Analyze hybridization: Aromatic or alkene carbons are sp2, resulting in 120° C-C bond angles.
Why D is correct:
- All statements align with organic chemistry definitions: chirality requires tetrahedral carbons with four distinct groups, molecular formula from atom count, and sp2 hybridization dictates 120° angles per VSEPR theory.
Why the others are wrong:
- A: Omits valid statements 2 and 3 on formula and angles.
- B: Excludes valid statement 3 on bond angles.
- C: Excludes valid statement 1 on chirality.
Final answer: D
Topic: Halogen compounds
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