A well known non steroidal anti inflammation drug NSAID exists in two sterochemical forms. Only one is biologically active. Below is the structure of the biological active form. Identify the chiral center and determine if it is the R- or S- stereoisomer.

2. Draw the optical isomers of CH3-CHOH-CHOH-CH3 . INDICATE the absolute configuration of each chiral center. Which are enantiomers? Which are diastereomers? Is there any meso compound present? Identify if yes.

3B. and 3G

What are the fuctional group changes in the both structures shown in the image?

Using the drawing space below, draw the mirror image of the following molecule: CI H OH Br Once you have drawn the mirror image, decide whether your mirror image is an enantiomer of the molecule above, and click the yes or no button under the drawing area. Click and drag to start drawing a structure. Is your mirror image an enantiomer? O Yes Ο NO × × ●● Ś Ś

3. Draw the structural formula of 3-bromo-2-chloropentane. Identify the chiral carbons with asterisks. Using 2n formula (n is number of chiral centers) calculate the number of stereoisomers. Construct 2 pairs of mirror images. Take one pair of the enantiomers, compare it with the either of the models of the second pair of enantiomers. Are these two molecules mirror images? Draw the fisher projections of the four stereoisomers and identify diastereomers.

Astaxanthin, the molecule shown below in the green box, is a natural product responsible for the pink colors in flamingos. How many chiral centers does astaxanthin have? HO HO 0 1 O 2 0 6 O 4

For the compound below, state its systematic name, its functional group(s), and whether or not it is chiral. CH3CH2CH=CHCH3

For this question, redraw the structure and label each chiral center clearly. You will need to upload your answer when finished. For the following molecules assign the configuration at each chiral center as R or S. Br 2 OCH3 F

For molecule CH3CH2CH(OH)CH3a. Identify chiral centreb. Draw a pair of enantiomers using 3-dimensional structure