sbro-o1m6-ans - Form 0 CHE321 Multiple Choice Questions 60...

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Form 0 CHE321 Exam 1 9/26/2006 Multiple Choice Questions. 60 points 1. Draw the two best contributing structures for methylimidate. To get you started a partial structure is given. H C O NH CH 3 H C O NH CH 3 H C O NH CH 3 Choose the incorrect statement. (A) Both contributing structures have the same number of electrons. (B) Both contributing structure have exactly the same geometry. (C) One of the contributing structures has a negative charge on the nitrogen atom. (D) One of the contributing structures has a positive charge on the oxygen atom. (E) A double bond exists between the carbon and nitrogen atoms in both structures. analysis: This question requires you know how to draw different electron configurations (contributing structures or resonance structures) of a given molecule. This topic was discussed in the lecture and was part of quizzes and workshop problems. Scores for this question were high, 72% correct. 2. The carbon frame work of the molecule adamantane, C 10 H 16 , is shown below. adamantane Br Br Choose the correct number of bromoadamatanes (C 10 H 15 Br) that are possible. (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 analysis: This is a difficult problem if you had not done part 3 of workshop 2. Adamantane is a very symmetrical structure and there are only two different hydrogen atoms. Performance on this question was the poorest for all of the multiple choice questions, 26% correct.
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Form 0 3. From a consideration of the molecular orbital treatment of the hydrogen molecule, choose from the following statement that is incorrect . analysis: This question requires just a general understanding of molecular orbital theory and orbitals. Molecular orbital theory will be used throughout the course to help us understand certain chemical phenomena. 68% of the students got this question correct.
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