The presence of the carbonyl group in a molecule is easily confirmed by an intense line in

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The presence of the carbonyl group in a molecule is easily confirmed by an intense line in the infrared spectrum around 1700 cm−1 that corresponds to a C≡O stretching vibration. Locate this line in the calculated infrared spectrum of acetone (“acetone” on the pre-calculated Spartan file) and note its position in the overall spectrum (relative to the positions of the other lines) and the intensity of the absorption.

a. Speculate why infrared spectroscopy is a reliable diagnostic for carbonyl functionality.

b. Examine the lowest frequency mode for acetone and then the highest frequency mode. Describe each and relate to the relative ease of difficulty of the associated motion.

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Physical Chemistry

ISBN: 978-0321812001

3rd edition

Authors: Thomas Engel, Philip Reid

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