14C_s09_lec01_e02

14C_s09_lec01_e02 - C h e m is t r y 1 4 C S p r in g 2 0 0...

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Chemistry 14C Spring 2009 Lecture 1 Exam 2 Page 1 Please use the back of the data table pages and not the exam margins for scratch space. The ‘one point’ option is not available for this exam. Tripeptide (Formula = C 15 H 21 N 3 O 4 S) Questions 1–11 refer to Tripeptide: 1. (6) Complete this description of the molecular ion portion of Tripeptide’s mass spectrum by writing appropriate numbers in each blank. When the intensity of M is 100%. .. (a) . .. m/z for M is __________ (a number with no decimal places) (b) . .. the most precise value for intensity of M+1 is ___________ (a number with one decimal place) (c) . .. the most precise value for the intensity of M+2 is __________ (a number with no decimal places) 2. (2) In the mass spectrum of Tripeptide, a peak at m/z = 180 is (circle one): Molecular ion M M+1 M+2 A fragment A base peak None of these In questions 3–9 complete the sentences by writing numbers in the blanks. For these questions we assume that all J values are equal, all coupling is first-order, all signals are resolved (i.e., signals do not overlap), and the smallest integral = 1. 3. (2) Among all of the hydrogen atoms in Tripeptide, __________ is/are not equivalent to any other hydrogen atoms in the molecule. 4. (6) When the smallest integral = 1, the 1 H-NMR spectrum of Tripeptide includes __________ signal(s) of integral = 1, __________ signal(s) of integral = 2, and __________ signal(s) whose integral is more than 2.
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14C_s09_lec01_e02 - C h e m is t r y 1 4 C S p r in g 2 0 0...

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