A-LevelChemistryAnalytical techniques9701/12 · May/June 2025 · Q401 Mark

The mass spectrum of CH3Cl shows a molecular ion peak, M⁺, at the m/e value of 50 with a relative abundance of 18.0%. Other peaks are present in the mass spectrum. What is seen in the mass spectrum at the m/e value of 52?

Apeak with relative abundance of 4.5%

Bpeak with relative abundance of 6.0%

Cpeak with relative abundance of 18.0%

Dpeak with relative abundance of 54.0%

✓ Correct answer

B: peak with relative abundance of 6.0%

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Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2025 Paper 1 Variant 2, question 40.

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