Structures m through t are for questions 1 through 10 and are all the combinatio
ID: 528695 • Letter: S
Question
Structures m through t are for questions 1 through 10 and are all the combinations of left and right OH groups on the center 3 carbons of a Fischer projection. Remember that drawing OH groups right or left on the top and bottom carbons does not matter. Though there are 8 combinations draw it does not mean that they represent 8 different compounds. How many total R and r centers are in structure m? Chiral and pseudochiral centers are called stereogenic centers because switching two groups on either leads to another stereoisomer. a. 0 b. 1 c. 2 d. 3 e. not a.-d 2. Structure n is? a. achiral but not meso b. chiral c. Meso d. not a -c What is the relation between structures g and s? a. constitutional isomers b. diastereomers c. enantiomers d. equivalent e. not a.-d The earliest literature reference for the optical rotation of a pure enantiomer of a chiral stereoisomer of structures m-t lists a specific rotation of 7.35 degree If a more recent reference gives a specific rotation of 10.3 for the same pure enantiomer, assuming this latter rotation is correct, what was the composition of the major enantiomer of the 7.35 degree mixture? Interestingly, an elevated ratio of the major to minor enantiomer is an indication of a yeast infection in humans a. (I+7.35/10.3) times 100 % b. (1-7.35/10.3) times 100% c. (1+7.35/10.3) times 50% d. (1-7.35/10.3) times 50% e. not a.-d Structure o for sure is? Structure o is a common sugar substitute and is poisonous to dogs a. d b. D c. d. L e. not a.-d How many unique compounds (stereoisomers) are in the family of structures m through t, 4 d. 8 c. 6 e. not a.-d Structures p and r should have the same^13C NMR? a. true b. false Structures m and t should have the same taste? a. true b. false How many^13C NMR signals should the following compounds have? Answers may be repeated. Structure o _________ Structure p ____________ a. 1 b. 2 c. 3 d. 4 e. not a.-d.Explanation / Answer
1. (d) there are 2 pseudochiral and 1 chiral center. so, in total 3.
2. (b)
3. (b) Distereomer.
4. (b)
5. (d)
7. (b)
8. (A)