The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B,...

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The mass spectrum of 3-bromopropanoic acid is shown below. Four peaks are labeled with A, B, C, and D. Select the label for t

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Answer 1

Answer #1

The base peak in mass specrum is the peak with 100% relative abundance . It need not necessarily be the parent ion( equatl to molar mass).

Here in the given spectrum the base peak is at m/z =73 (100%, on y- axis) PEAK A

The molecular ion is 152 and all the peaks are accompanied by M+2 peaks with equal abundance due to the presence of Br(Br has two isotopes 79 and 81 with equal abundance).

The base peak at 73 is due to the loss of Br ( M⁺ - Br)

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Answer 2

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