2008chem14c(mid2) - Chemistry 14C Winter 2008 Midterm Exam...

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Chemistry 14C Winter 2008 Midterm Exam 2 Page 1 For any question on this exam worth three or more points, you have two choices: answer the question as written or you may write and circle the phrase “one point”. If you write “one point” you will receive one point (and only one point) of credit for the question. “One point” overrides anything you have written for that question, regardless of its accuracy. Example: (10) Briefly explain everything about organic chemistry. One point 1. (2) Circle the formula(s) that are consistent with the following mass spectrum: m/z = 164 (M; 100%), m/z = 165 (11.2%), m/z = 166 (0.42%). C 10 H 12 O 2 C 10 H 12 S C 10 H 14 NO C 11 H 18 O C 10 N 2 O 2. (6) The mass spectrum of a molecule whose formula is C 11 H 15 Br was found to include peaks at m/z = 225, 226, 227, 228, and 229 (among others). (a) Circle one or more peaks that are due to molecular ions: 224 225 226 227 228 None of these Cannot determine (b) Circle one or more peaks that are due to fragments: 224 225 226 227 228 None of these Cannot determine (c) Circle one or more peaks that are base peaks: 224 225 226 227 228 None of these Cannot determine 3. (6) Deduce the molecular formula(s) that are consistent with the given mass spectrum. Write your answer(s) in the boxes below (one formula per box). There may be more boxes than formulas, but there are not more formulas than boxes. Mass spectrum: m/z = 181 (M; 100%), m/z = 182 (13.75%), m/z = 183 (0.35%) Work space:
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Chemistry 14C Winter 2008 Midterm Exam 2 Page 2 Hydroxyzine is an antihistamine that works by antagonizing (blocking) the H 1 receptor. It also has antiemetic and mild anxiolytic (anti-anxiety) properties. Cetirizine, a major human metabolite of hydroxyzine, also has antihistamine properties. (These two drugs illustrate nicely the concept that similar molecules often have somewhat
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