CHEM 2311 Midterm: CHEM 2311 GT Examp5i
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Copies of tables 2. 7, 9. 1, and 9. 2 are attached. You may use a calculator on this exam: (32 points) circle the letter on the right which corresponds to the answer to each question. What principle allows you to predict that it would be a triplet: integration, chemical shift, n + 1 rule, shielding (iii) predict the splitting pattern you would observe for the proton at c3 of. 2,3-dimethyl-2-phenylbutane: singlet, sextet, quartet, septet (iv) how many 13c signals would 1,3-dichlorobenzene give, 3, 4, 5, 6 (v) the protons of the methyl groups of tetramethylsilane (tms) are highly shielded and appear at = In the corresponding carbon compound, 2,2-dimethylpropane, the methyl groups appear at = 1. 00 ppm. 1-chloro-2-methylbutane: 3-chloropentane (viii) in 13c nmr spectroscopy, the signal due to which type of carbon occurs furthest downfield. 1h nmr: a septet (1h) downfield from a doublet (6h) (iii) compound c: c5h12o. 1h nmr: two singlets (iv) compound d: c8h8cl2.
