exam_answers_Exam 2_Key - Name: _KEY_ Student #: _ Multiple...

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Name: ___________KEY_______________ Student #: _______________________ Multiple Choice (2 points each) 1. Which of the following statements are true. (A) If a molecule has a plane of symmetry it is achiral. (B) If a molecule has a center of symmetry it is achiral. (C) If a molecule has one stereogenic center it is chiral. A) A and B B) A and C C) B and C D) A, B, and C 2. (+)-Tartaric acid has a specific rotation of +12.0 0 . What is the specific rotation of a mixture of 75% (+)-tartaric acid and 25% (-)-tartaric acid? A) +4.0 0 B) +6.0 0 C) +8.0 0 D) +9.0 0 Works similarly to optical purity. Observed rotation = (mol fract.(+) x +12°) + (mol fact.(-)x(- 12°) 3. Which of the following is not a metal catalyst for the hydrogenation of an alkene? A) Pd B) Pt C) Na D) Ni 4. Which of the following does not give 1,2-dimethylcyclohexene as one of the acid- catalyzed dehydration products? H 3 CC H 2 OH H 3 CO H CH 3 H 3 C CH 3 CH 2 OH CH 3 1) 2) 3) 4) A) is 1 B) is 2 C) is 3 D) is 4 (1) forms the product by a hydride shift; 2) forms the product by a methyl shift, 3) gives the product directly, 4) may stabilize primary carbocation via a hydride shift, but the product will be 1,1-dimethylcyclohexene.)
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This note was uploaded on 02/10/2011 for the course CHEM 2420 taught by Professor Staff during the Spring '08 term at Univeristy of Wyoming- Laramie.

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exam_answers_Exam 2_Key - Name: _KEY_ Student #: _ Multiple...

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