Below are spectra of three compounds. One of the compounds contains chlorine, th

Question

Below are spectra of three compounds. One of the compounds contains chlorine, the other bromine
and the third sulfur. Match the spectra A, B and C with corresponding compounds, explain your choice.

Sorry for having 3 picks but dont have enough points for 3 seperate questions. I also hope you can see the images. please help. really need it been trying to figure out this question but cant figutr out which one is which. I have an idea of each but not sure and why. please expalin why. thanks so much would give a lot more for this question but no more points. thanks so much.

Explanation / Answer

First spectrum is of bromine containing compound because bromine has two natural isotopes 79Br and 81Br in 1:1 ratio (because their natural abundance ratio is 1:1). You can see there are two such peaks which have difference in their m/z values by the value of two units and peak are of 1:1 ratio in terms of intensity. -------------------------- The third spectrum is of Chlorine compound because chlorine has two natural isotopes 35Cl and 37Cl with natural abundance 3:1. See carefully in third spectra the two peaks on left side are having two closely placed peaks with difference in their m/z values by the value of two units and peak are of 3:1 ratio (same as the ratio of their natural abundance) in terms of intensity. ------------------The third spectrum is of sulfur compound as it does not have any 3:1 or 1:1 peaks separated by 2 units. Also remember sulfur has 4 stable natural isotopes therefore there will be 4 peaks for each major peak containing sulfur. ------ I am answering only in terms of which atom contains which heteroatom and not the structure of the compound.

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