Which one of the following statements about the mass spectrum of CH3Br is correct?
Answer: Just one peak for molecular ion at m/z values of 95
Explanation
- The mass spectrum of CH3Br (methyl bromide) shows two peaks at m/z values of 94 and 96, corresponding to the molecular ions [CH3Br]+.
- These peaks are due to the natural abundance of bromine isotopes, 79Br and 81Br, which are present in a ratio of approximately 3:1.
- As a result, the peak at m/z 94 ([CH379Br]+) is about 3 times more intense than the peak at m/z 96 ([CH381Br]+).
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