quiz2-1999-2000

quiz2-1999-2000 - BF 3 CH 3 NH 2 H + Cl-Answer:...

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Quiz #2, CHEM 111, Fall Semester, 1999/2000 Student Name: Student ID #: Section: Note: You are required to complete all questions independently and reference materials are prohibited. Total marks for this quiz is 50 points. Question 1: Indicate which of the conformations shown below is more stable and provide your reasoning. (10 points) H CH 3 CH 3 CH 3 H H CH 3 H 3 C CH 3 H H H (A) (B) Answer: Question 2: Label all positions in the given chair conformation of cyclohexane as axial (a) or equatorial (e). (5 points) Answer: Question 3: Indicate (C) and (D) as either a 1,4-trans disubstituted cyclohexane or its cis isomer. Which isomer is more stable? Give your reasoning. (10 points) X Y Y X (C) (D) Answer: Question 4: Classify each of the following as either nucleophiles or electrophiles: (5 points)
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Unformatted text preview: BF 3 CH 3 NH 2 H + Cl-Answer: electrophiles nucleophiles (continue to reverse side for Question 5 ) Question 5: Given below is a reaction energy diagram for a two-step reaction. Label the positions of (a)-(e) and answer the following questions: (20 points) (i) Indicate the change in the first and second steps, respectively; (ii) Explain the meanings of ∆ G°, ∆ G 1 ≠ , and ∆ G 2 ≠ ; (iii) Which step is faster? (iv) The overall reaction is endothermic or exothermic? (a) (b) (c) (d) (e) ∆ G° ∆ G 1 ≠ ∆ G 2 ≠ Reaction progress Energy Answers: (a) is (b) is (c) is (d) is (e) is (i) first step: ( ) → ( ); second step: ( ) → ( ) (ii) ∆ G° is ∆ G 1 ≠ is ∆ G 2 ≠ is (iii) (iv)...
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quiz2-1999-2000 - BF 3 CH 3 NH 2 H + Cl-Answer:...

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