Organic Chemistry

Learn the toughest concepts covered in Organic Chemistry with step-by-step video tutorials and practice problems by world-class tutors.

15. Analytical Techniques:IR, NMR, Mass Spect

Mass Spect:Isotopes

1

concept

The (M + 1) Peak

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9m
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2

concept

The (M + 2) Peak

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3

concept

The Nitrogen Rule

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3m
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4
Problem

Propose the number of carbons for a compound that exhibits the following peak in its mass spectrum: 

(M)+• at m/z = 72, relative height = 38.3% of base peak

(M+1)+• at m/z = 73, relative height = 1.7% of base peak 

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Problem

Predict the approximate height of the (M + 1) peak for the molecule icosane, molecular formula C20H42.

6

concept

Draw expected isotope pattern Intro

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7
Problem

Draw the expected isotope pattern that would be observed in the mass spectrum of CH2Br2. In other words, predict the relative heights of the peaks at M, (M + 2), and (M + 4) peaks.