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In the 1H NMR Spectra of Which of the Following δ\delta

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In the 1H NMR spectra of which of the following substances,C9H10O,would you expect to see two singlets in the range of δ\delta 2.0-2.5 ppm?  In the <sup>1</sup>H NMR spectra of which of the following substances,C<sub>9</sub>H<sub>10</sub>O,would you expect to see two singlets in the range of  \delta 2.0-2.5 ppm?   A)  I and III B)  I,II,and III C)  IV D)  V E)  All of the above substances would exhibit two singlets \delta  2.0-2.5 ppm in their <sup>1</sup>H NMR spectra.


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