O Levels Chemistry (5070)•5070/12/O/N/22
Explanation
Bond orders in molecular pairs Steps:
- Identify the pairs of atoms in each option: for A, C-H in CH4 and C-O in CO.
- Determine bond order for each pair: single bond = 1, double = 2, triple = 3.
- Compare bond orders within each option to find matching values.
- Select the option where both pairs have identical bond order.
Why A is correct:
- Both the C-H pair in CH4 and the C-O pair in CO are held together by single bonds (bond order 1), per basic covalent bonding definitions.
Why the others are wrong:
- B: N≡N (triple, 3) differs from H-H (single, 1).
- C: O=O (double, 2) differs from C-H (single, 1).
- D: O=O (double, 2) differs from N-H (single, 1).
Final answer: A
Topic: Simple molecules and covalent bonds
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