CEM143_2006_quiz_10 - An unknown chemical contains only...

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CEM 143 QUIZ 10 29 November 2006 Name ___________ ___ __ ____________ _______________________ Section _______ 1. (6 pts.) Compound Z (C 2 H 6 O) reacts with an oxidizing agent give Y (C 2 H 4 O). The infra-red (IR) spectrum of Z shows a broad band centered near 3400 cm -1 . The IR spectrum of Y shows a strong band near 1700 cm -1 . In the 1 H NMR spectrum of Y , there is a distinctive signal at 10.3 ppm. In the boxes below, provide the structure of compound Z, Compound Y , and the reagent used in the reaction. 2. (2 pts.) An unknown compound was identified as diethyl benzene, but which isomer is it? You run a 13 C NMR spectrum of diethyl benzene and find that the spectrum contains four 13 C resonances (signals). Circle the isomer that matches the spectral data. 3. (2 pts.)
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Unformatted text preview: An unknown chemical contains only carbon, hydrogen, and oxygen. It was analyzed by mass spectrometry, and the data are shown below. What is its molecular weight? CH 2 CH 3 CH 2 CH 3 CH 2 CH 3 CH 2 CH 3 CH 2 CH 3 CH 2 CH 3 compound Z compound Y oxidizing agent 2 point bonus! What is its formula? Molecular weight of the unknown. 4. (10 pts.) Below are the NMR spectral data for compound X (C 3 H 6 O 2 ). The integrated intensities of each signal are shown above each resonance. In addition to the NMR data, IR measurements showed a strong absorption band near 1700 cm-1 . Show your work to receive partial credit for this problem. 1 2 3 4 5 6 7 8 9 ppm 50 100 150 200 ppm 1 H NMR 3 H 3 H 13 C NMR Structure of compound X....
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CEM143_2006_quiz_10 - An unknown chemical contains only...

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