SCHEME 5.
A: X = H; m/z = 118; X = CI: m/z = 154–152. X = Br: m/z = 198–196; X = NO2: m/z = 163. D: X = H m/z = 92; X = CI: m/z = 128–126; X = Br: m/z = 172–170; X = NO2: m/z = 137.
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