Matching molecular formula to given relative molecular mass Steps:

• Use standard atomic masses: C=12, H=1, O=16, Cu=63.5 (rounded for calculation).
• Calculate Mr for A: Cu(OH)₂ = 63.5 + 2(16 + 1) = 97.5.
• Calculate Mr for B: CH₃CO₂ (C₂H₃O₂) = 2(12) + 3(1) + 2(16) = 59.
• Calculate Mr for C: CH₂O = 12 + 2(1) + 16 = 30; for D: CH₄O = 12 + 4(1) + 16 = 32.
• Compare to 196: No option matches exactly; nearest is A at 97.5 (×2 ≈195, close but not precise).

Why none match:

• Relative molecular mass must equal the sum of atomic masses in the formula; 196 requires a different composition.

Why the others are wrong:

• A: 97.5 ≠ 196 (even ×2=195 approximates but doesn't match exactly).
• B: 59 ≠ 196.
• C: 30 ≠ 196.
• D: 32 ≠ 196.

Not enough information to select one option.

Final answer: None