Question

Identify which of these four mass spectra indicate the presence of sulfur, chlorine, bromine, iodine, or nitrogen. Suggest a molecular formula for each. 100 abundance 8 $ 38 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 mily abundance 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 z 8 8 8 abundance $ 8 LL 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 Nowe oddM even francais abundance 10 500 0 500 100 110 120 130 140 150 160

Answer 1

mass spectro (br. 156, 127, 29, Mt = 156 This specho indicates presence of Todine. because mass specta show fragment at 127. 127 I Rule of thirteen = Mt. 13 156 13 = = 12 Molecular formula = 12H12 Слоні гер) а сеd ь 121 1 M. FF C2H5 I The nature aboundance of iodine 127 is 100% CH3 CH21 Base peak) (M+2] peak harina mass specha: cc). go (M), g2 CM+2, 55 moss spectro (c) shows 1/3rd of its intensity. go [M] 1004. 92 +2] 30%

chloine has aboundance 3 :1 35 : 37 cl two is isotope having 35 d (100 natural to Rule of thirteen = go 06 6 + 12 13 13 i M. F = C6H18 CH1 replaced by 35c1 T . M.F= C4HCI 19-35 C4H7 C4 H7 golga 55 cally c] m 37. Call 92 55. amass Speche;[d] 115 , 100, 86 (Base peak). note: odd to peak. - even fragments. odd mt peaks meon odd number of nitrogen ever rugments indicater one nihogen atom, Rule of thirteen = Mt 115 8 + 11 13 - 13- 13.

molecular formula= C&Hig - CH2 replaced by N. - M. f = C7H17NI smctire may be M-15 115 100 86 me