Please help with answering these questions 1. Explain why a compound containing

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Please help with answering these questions

1. Explain why a compound containing 2 bromines displays a 1:2:1 ratio for the M:M+2:M+4 peaks. 2. Compounds with lodine in them rarely show a MS peak for the compound with lodine. Instead the biggest peak observed in the MS spectrum is M-127. Explain why this is observed. 3·Two unknown vials are on the bench top. One vial contains N,N-Dimethylaminopyridine. The other contains N,N-Dimethylaniline. MS analysis revels that Vial 1 has an mass which is even and vial 2 has a mass which is odd. Identify what substance is in each vial.

Explanation / Answer

answer to 1

1 bromine show in mass spectrum M+ and M+2 signals in ratio 1:1

in case of two bromines three signals M+, M+2 and M+4 gives with relative heights 100: 195 : 96, because there will be molecules containing 79Br2, 79Br81Br, and 81Br2

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