Which of the following is the most stable conformation of cis-1-isopropyl-3-methylcyclohexane? CH(CH;), CH(CH;)2 CH3 CH3 CH(CH3)2, CH(CH3)2 H;C H;C a b d Rank the compounds from weakest to strongest in acid strength. F .F OH HO HO F

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The structure of 4 isomers of ketopentose are shown.  1) select every structure that is a diastereomer of structure D A, B, or C? 2) select every structure that is a enantiomer of structure C A, B, or D 3) select every structure that is a stereoisomer of structure C A, B, or D

Choices a.3 b. 2 c. 4 d. 1

Which of the following structures represents the most stable conformation of cis-1-ethyl-2-methylcyclohexane? Select one: Me O a. Et O b. c. Me. Et d. Me Et Which of the following structures would be the most stable carbocation? Select one: O a. O b. Ос. O d.

Which one of the following is the s-trans conformation of (E)-2-methyl-2,4-hexadiene? A) Select one: OA. B OB. D OC. C OD. A n B) C)

2. a) Draw the most stable chair conformation of cis 1-isobutyl-2-methylcyclohexane. b) Draw a Newman projection of the best conformation of 2,3-difluorobutane looking down the C2-C3 bond. 3. Compound X has the formula C46H90O4. Compound X reacts with excess H2/Pd to give C46H9204. How many rings does compound X have? Show how you got your answer. 4. For each pair state whether the two are a) the same molecule, b) different compounds that are not isomers, c) constitutional isomers, d) diastereomers, or e) enantiomers. A) B) ÇH3 CH3 Br Br HS CI CI- SH H Br Br CH3 CH3

1) The most stable chair confirmation of

Give the relationship between each pair of molecules below (constitutional isomers, diastereomers, enantiomers, or identical). Note that molecules may not necessarily be shown in the same conformation. 3. OH ОН ОН ОН (a) (b) ОН H OH (c) CH3 .CI (d) Н. .CH3 CH3 CH3 ОН TCI H H CI OH F Br Br ОН ОН ОН ОН (e) (f) CI ОН ОН (g) .cO NH2 NH2 .. O II S: