Question

97. Which of the following mass spectra shows the presence of bromine in a compound? s00- as- 80- 40- 20 125 2e 30 m/s II co- o 20 10 III IV Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology I В) I C) III D) IV E) none of these R e renay Reltive nteraity Rdthe ir sly aga

Answer 1

ANSWER-

Bromine has two isotopes, ⁷⁹Br and ⁸¹Br in an approximately 1:1 ratio That means that a compound containing 1 bromine atom will have two peaks in the molecular ion region, depending on which bromine isotope the molecular ion contains. one is M⁺ peak and other is M+2 peak of almost equal intensity .

so here first spectrum is showing these type of peak at approx 140 and 142 so the correct answer should be (A)