11. What is the relationship between the two structures shown? a) same compound H H₂ Br CI CI Br b) enantiomers and Br H. Br H CI CI c) diastereomers d) none of these

O O CI + enantiomer + enantiomer CI + enantiomer CI + enantiomer CI + enantiomer

The southern pine beetle utilizes a multi-component aggregation pheromone (one component shown below) to start mass colonization of healthy trees. The biosynthetic pathway involves the cyclization of this acetal from the straight chain structure. Draw the straight chain structure that could be used to form this acetal. Use wedges and dashes to correctly depict the stereochemistry. H3C O- 2 3 OH O Proble Atoms, Bo and Ring HS 5 466 HO S

Help identifying stereocenters

Which statement is true about these Fischer structures? CH3 CH3 CH3 HO CH3 it: -H HO- -H H- -OH H- HO- -H- H- -OH H- HO- -- CH3 CH3 CH3 CH3 I II III IV O A I and II are identical (same stereoisomers). II and IV are identical. I and II are diastereoisomers. O D.II is a meso structure.

8) How are the compounds in each pair related to each other? Are they identical, enantiomers, or diastereomers? I, E, D and Br Br Br and Br Br Br Br Br and Br Br. Br and Br Br Br Br

27. The relationship between the two molecules drawn below is: CH3 -Br H. Br2HC H' CH3 Br a. enantiomers b. diastereomers c. identical / conformational isomers / meso compound d. constitutional isomers e. different compounds (not isomers)

4. Classify each pair of compounds as either enantiomers, diastereomers, identical, constitutional isomers, or not isomers. x HO OH NH OH H. H HN HO Me H HO n-Pr Me -OH

Question 6 What is the relationship between the two structures shown? CH3 -H Br H H Br CH3 enantiomers O diastereomers O these are the same compound O constitutional isomers H I Br CH3 H Br CH3

2. Fill in the squares with the correct configuration (R or S) for the following compounds and determine whether they are Enantiomers, Diastereomers, the Same Compound or Constitutional Isomers. Br H₂N NH₂ "Br A) Enantiomers B) Diastereomers C) Same Compour D) Constitutional Isomers