Chapter 13: Q50P (page 612)
A mass spectrum shows significant peaks at m/z = 87, 115, 140, and 143. Which of the following compounds is responsible for that mass spectrum?

Short Answer
The compound is

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Chapter 13: Q50P (page 612)
A mass spectrum shows significant peaks at m/z = 87, 115, 140, and 143. Which of the following compounds is responsible for that mass spectrum?

The compound is

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Given that the force constants are similar for C¬H and C¬C bonds, explain why the stretching vibration of a C¬H bond occurs at a larger wavenumber.
Phenolphthalein is an acid–base indicator. In solutions of pH < 8.5, it is colorless; in solutions of pH > 8.5, it is deep red-purple. Account for the change in color.

Give approximate wavenumbers for the major characteristic IR absorption bands that would be given by each of the following compounds:

Question:How can IR spectroscopy be used to distinguish between the following compounds?
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