midterm2review

midterm2review - CHEMISTRY 140A MIDTERM EXAMINATION-2 FEB...

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CHEMISTRY 140A MIDTERM EXAMINATION-2 FEB 15, 2005 NAME (Please print): First Last Signature (written): ID NUMBER: DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO. - Please sign your name on the top of pages 1 through 10. - Please check that you have 11 pages (including this one; page 11 is blank for your scratch work). - Answer only in the space provided. D o n o t write answers on the b a c k o f a p a g e . - Please find p a r t i a l p e r i o d i c t a b l e in page 11. Question 1 2 3 4 5 6 7 8 9 Total Points 10 12 18 4 9 5 9 12 21 100 Score 1/11 College: Revelle Muir Marshall Warren Roosevelt Sixth Other Major:
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Chapter 4 (22 points) 1. (10 Points) For each of the following cyclohexane derivatives, please indicate (1) cis- or trans-isomer and (2) whether it is in its most stable conformation by circling the correct answer. NAME (Please print) First Last 2/11 cis or trans Most stable? Yes or No cis or trans Most stable? Yes or No cis or trans Most stable? Yes or No cis or trans Most stable? Yes or No cis or trans Most stable? Yes or No CH(CH 3 ) 2 HO CO 2 Me H 3 C I CH 2 CH 3 Br CO 2 H Cl CH 3 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0 1 o r 0
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2. (12 Points) (1) The axial and equatorial positions in cis-decalin can be interchanged by conformational isomerization of both rings. Please a d d t h e m i s s i n g s u b s t i t u e n t s in proper positions (i.e. o n e m e t h y l g r o u p and o n e h y d r o g e n a t o m on stereocenter) in the boxed decalin framework of the other chair-chair conformer of each cis- 2-methyldecalin (indicated hydrogen atom, H A-D , must be corresponding in each conformer). Each decalin given below is opptically active (single enantiomer). Also please indicate w h i c h i s m a j o r c o n f o r m e r in each equilibrium (i.e. more stable).
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This note was uploaded on 02/02/2009 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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midterm2review - CHEMISTRY 140A MIDTERM EXAMINATION-2 FEB...

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