14C_f07_e02

14C_f07_e02 - C h e m is t r y 1 4 C F a ll 2 0 0 7 M id t...

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Chemistry 14C Fall 2007 Midterm Exam 2 Page 1 The 1870 Ph.D. thesis of Russian chemist Vladimir Markovnikov included his studies on certain addition reactions of carbon-carbon pi bonds. These studies formed the basis for Markovnikov’s Rule, which we will learn more about in Chemistry 14D. Markovnikov’s work was remarkable because it was achieved without any sort of spectroscopy. In this exam we explore a reaction that Markovnikov may have studied. Br 2 H 2 O Br OH + OH Br Molecule X Molecule Y Molecule Z Questions 1-5 refer to how mass spectrometry might be used to study this reaction. 1. (2) Which molecule(s) cannot have a signal at m/z = 40 in their mass spectra? Circle all that apply. Molecule X Br 2 H 2 O Molecule Y Molecule Z 2. (2) Give a number: For molecule Y , m/z of M is _____________ 3. (4) The intensity of the M signal for molecule Y is set to 100%. (a) Give a number with one decimal place : The best estimate for the intensity of the M+1 signal for molecule Y is ___________ (b) Give an integer : The best estimate for the intensity of the M+2 signal for molecule Y is _________ 4. (2) Draw the Lewis structure (with all lone pairs) for the molecular ion of water. 5. (4) How can mass spectrometry be used to decide if the actual reaction product is molecule Y or molecule Z ? Complete each statement in ten words or less . Less significant answers will earn less significant credit . Write “none” if this is the best answer. (a) One significant similarity between the mass spectra of molecules Y and Z is. .. (b) One
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14C_f07_e02 - C h e m is t r y 1 4 C F a ll 2 0 0 7 M id t...

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