No. 1 MW=106. No. 2 MW=156 [C 6 H 5 ] + [M-H] + M CHO [C 4 H 3 ] + 51 M+1

1 No. 1 [C 6 H 5 ] + [M-H] MW=106 CHO [C 4 H 3 ] + 51 M No. 2 M+1= 4.2 / 64.1*100 = 6.6% : 1.1 = 6*C M+2= 63.7 / 64.1*100 = 99.4% = Br [C 6 H 5 ] + [C...

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