Question

Calculate the ratio of the (M+2)⁺ and the (M+4)⁺ to M⁺ peak heights for

a) C₁₀H₆Br₂

b) C₃H₇ClBr

c) C₆H₄Cl₂

Note: Only consider the halide isotopes, don’t consider the carbon isotopes.

Most Abundant isotope Abundance of other isotopes relative to 100 Parts of the most abundant

35Cl 37Cl-32.5

79Br 81Br-98.0

Answer 1

Answert Natural ab und ance & 3 set= 100%. 37cd= 32.5%. + By = 100% & Br= 98.%. Probability: 35cd= 0.76 37cd= 0.24 79 Bra 0.51 BABY= 0.49 (a) JOH Brz M+2= No. of Br atom in molecule x naturen abundance of 82 Br = 2x 98 = 1964. • M+ 4 = 81 Br i 2 BY - I way Probability - Probability 82 BY of x Probability of . of J-0.490.490.24 XIOO 8t Br M + 4 0.4 100 90 % M +4 24% 24V Probability of M Pradability of mo. Probability of 79 Bx x ۵ لنت له بدهم = 0.sixo. S ۷ و ۶ = 0.26 /M+4= 24%. Ratio Mt M+2 M+ 4 ł 1:2:1

(B) C3H7 CA Br, M+2= (No. of Br x Natural abundance of BI Br J * (No. of ctx Natural abundance of 37(1) = (1 x gft (3 x 32.5) = 130.5%. Probability of Mt (Probability of 35cAnx (Probably of 79Br) - O.sixo.76= Protability of of M+4= 0.3876 (Probability of 37cx x ه وتلد له بدهم دور o.za xo.49 x 10oz 11.76.1. 1. of m+4= 11.76%. 0.3876 [31] Iso ratio wit : MAR: Mta 0 130.5 31 C6Haciz M -900.. M+2= (No. at clx Naturen = (2x 32.5 = 65% aub und ance of 371) • M44 - Probability of Mo Probabilt of 3 SAX Probabile of 35cd = 0.76 .76 0.577.6 Probability. af M44 = Probability of 27c1 x Probability of 3704 Ixlon - 10.24 x 0.291x100 5.764. y of m+4= .. 5.76 0.5776 = 100% Mit: M+2. M +4 100: 65% tool