Discussion
The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH3Br) in the mass spectrum is
Answer: C
The M+ and (M+2)+ peaks are in the ratio 1:1.
Bromine has two stable isotopes, 79Br (about 50.7%) and 81Br (about 49.3%), two mass units apart and almost equally abundant. CH379Br gives the molecular ion at m/z 94 and CH381Br the ion at m/z 96, so the two peaks are of nearly equal height.
3:1 is the pattern of chlorine (35Cl : 37Cl), which is the usual trap here. 1:3 reverses it, and 1:2 matches no single halogen.
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