quiz2-2000-2001

quiz2-2000-2001 - X Y X Y(C(D Answer i(C is a disubstituted...

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v2.1 Quiz #2, CHEM 111, Fall Semester, 2000/2001 Student Name: Student ID #: Section: Note: You are required to complete all questions independently. Rreference materials are prohibited. Total marks for this quiz is 50 points. Question 1: Indicate which of the conformations shown below is less stable and provide your reasoning. (10 points) CH 3 H 3 C H H CH 3 H CH 3 CH 3 H H CH 3 H (A) (B) Answer: i. ( ) is less stable. ii. (A) is conformation, having iii. (B) is conformation, having Question 2: Label all positions in the given chair conformation of 1,3,5-trichlorocyclohexane as axial (a) or equatorial (e). (6 points) Answer: i. H H H H Cl H H Cl H H H Cl ii. How many chlorine atoms are in the equatorial position? Question 3: Indicate (C) and (D) as either a 1,3-trans disubstituted cyclohexane or its 1,3-cis isomer. Which isomer is more stable? Give your reasoning. (9 points)
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Unformatted text preview: X Y X Y (C) (D) Answer: i. (C) is a disubstituted cyclohexane; ii. (D) is a disubstituted cyclohexane; iii. is more stable than because . v2.1 (Continue to reverse side for Question 4 ) Question 4: Classify each of the following atoms in bold face as either a nucleophile or an electrophile: (10 points) (a) B Br 3 (b) CH 3 N (CH 2 CH 3 ) 2 (c) CH 3 O H (d) I-(e) RR C =O Answer: electrophiles ( ), ( ), ( ), ( ), ( ); nucleophiles ( ), ( ), ( ), ( ), ( ). Question 5: Given below is a reaction energy diagram for a one step reaction. Answer the following questions: (15 points) Energy Reaction progress (a) (b) (c) (e) (d) Answer: i. (a) is ; (b) is ; (c) is ; (d) is ; (e) is . ii. This reaction is endergonic or exergonic? ; iii. Increase the value of (e) will cause what effect on the reaction? ....
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This note was uploaded on 02/27/2010 for the course CHEM CHEM111 taught by Professor Dai during the Fall '06 term at HKUST.

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quiz2-2000-2001 - X Y X Y(C(D Answer i(C is a disubstituted...

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