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Chapter 13: Q26P (page 567)
Which shows an O-H stretch at a larger wavenumber: ethanol dissolved in carbon disulfide or an undiluted sample of ethanol?
An undiluted sample of ethanol shows an O-H stretch at a larger wavenumber than ethanol dissolved in carbon disulfide.
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Question: Draw a structure for a carboxylic acid that has a molecular ion with an m/zvalue of 116.
Question: A solution of ethanol has been contaminated with benzene鈥攁 technique employed to make ethanol unfit to drink. Benzene has a molar absorptivity of 230 M-1 cm-1 at 260 nm in ethanol, and ethanol shows no absorbance at 260 nm. How can the concentration of benzene in
the solution be determined?
For each of the following pairs of compounds, identify one IR absorption band that could be used to distinguish between them:
a.
b.
c.
d.
e.
f.cis-2-butene and trans-2-butene
g.
h.
i.
j.
k.
l.
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?
Which occurs at a larger wavenumber:
a. the C=O stretch of phenol or the C-O stretch of cyclohexanol?
b. the C=O stretch of a ketone or the C=O stretch of an amide?
c. the CN stretch of cyclohexylamine or the CN stretch of aniline?
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