Organic Chemistry (6th Edition)
Organic Chemistry (6th Edition)
6th Edition
ISBN: 9781260119107
Author: Janice Gorzynski Smith
Publisher: McGraw Hill Education
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Chapter 12A.3, Problem 9P

The base peak in the mass spectrum of 2, 2, 4-trimethylpentane [ ( CH 3 ) 3 CCH 2 CH ( CH 3 ) 2 ]

occurs at m / z = 57 . What ion is responsible for this peak and why is this ion the most

abundant fragment?

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CO9TO9Q4167 The mass spectrum of an unknown compound has a molecular ion peak with a relative intensity of 54.77% and an M+1 peak of 6.66%. How many carbon atoms are in the compound? (Fill in an integer number)
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The mass spectrum of n-octane shows a prominent molecular ion peak (m>z 114). There is also a large peak at m>z 57,but it is not the base peak. The mass spectrum of 3,4-dimethylhexane shows a smaller molecular ion, and the peak atmass 57 is the base peak. Explain these trends in abundance of the molecular ions and the ions at mass 57, and predict theintensities of the peaks at masses 57 and 114 in the spectrum of 2,2,3,3-tetramethylbutane.
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