EXAM_2_Review_Key - CHEM 237 Exam 2 Review Questions...

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CH 3 Cl CH 3 CH 2 CH 3 CH 2 CH 3 H 3 C Cl H CH 2 Cl H H CH 2 CH 3 CH 3 H 3 C Cl CH 2 CH 3 H H 3 C Cl CH 2 CH 3 I II III IV V CHEM 237 Exam 2 Review Questions (Answer Key will be sent Tuesday ~6 PM) Answer Key 1. A 50:50 mixture (by moles) of a pair of enantiomers is called a racemic mixture. 2. A compound has 3 chiral carbon atoms. What is the maximum possible number of stereoisomers this compound can have? 8 3. A mixture of enantiomers that contains a 50% enantiomeric excess (is 50% optically pure) of the (R) isomer, contains 75% or the R and 25% of the S forms. 4. Comparing isopropyl alcohol and 2-methyl-2-butanol, only 2-methyl-2-propanol contains a tertiary carbon atom. 5. (True/False) Single bonds between the atoms of cyclohexane are normally capable of free rotation. False 6. How many chiral carbons are in the compound _-cadinene. 3 8. Enantiomers have almost all the same physical properties. One physical property that distinguishes two enantiomers is that they rotate PPL in equal but opposite directions. 9. What is the stereochemical relationship between (2R,3R,4R)-trichlorohexane and (2S,3S,4R)-trichlorohexane? They are diastereomers. 10. (True/False) None of the cis -dimethyl isomers of cyclohexane are chiral. True 11. Hyperconjugation is MOST useful for stabilizing which of the following? a. pentyl radical b. tert -butyl radical c. isopropyl radical d. ethyl radical e. methyl radical 12. (R)-2-Chlorobutane is represented by: a. I b. II c. III d. IV e. V H 3 C CH 3 CH(CH 3 ) 2
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CH 3 OH H CH 3
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EXAM_2_Review_Key - CHEM 237 Exam 2 Review Questions...

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