9th Edition

ISBN: 9780137249442

Author: Wade

Publisher: INTER PEAR

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This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is als…

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Textbook Question

Chapter 12, Problem 12.20SP

(A true story) While organizing the undergraduate stockroom a new chemistry professor found a half-gallon jug containing a cloudy liquid (bp 100-105 °C), marked only “STUDENT PREP.” She ran a quick mass spectrum, which is printed below. As soon as she saw the spectrum (without even checking the actual mass numbers), she said, “I know what it is.”

Chapter 12, Problem 12.20SP, (A true story) While organizing the undergraduate stockroom a new chemistry professor found a

a. What compound is the “student prep”? Any uncertainty in the structure?
b. Suggest structures for the fragments at 136, 107, and 93. Why is the base peak (at m/z 57) so strong?

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Chapter 12, Problem 12.19SP

Chapter 12, Problem 12.21SP

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Chapter 12 Solutions

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Solution Summary: The author explains that mass spectroscopy provides a reliable molecular weight for an unknown compound. Fragmentation produces most stable carbocation and radicals when it occurs in alkane.

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