The compound which gives a fragment at \(m/z = 124 [M+H]^+\) is:
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In mass spectrometry, identifying the correct fragmentation pattern requires understanding the molecular structure and typical mass loss during ionization.
Compounds with similar molecular weights can often yield different fragment ions based on their structural features.
The fragment at \(m/z = 124\) corresponds to a specific molecular weight, and by examining the structures of the compounds and their likely fragmentation patterns, Compound B matches the observed mass for the fragment ion at \(m/z = 124 [M+H]^+\).