Structures m through t are for questions 1 through 10 and are all the combinatio

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 or left on the top and bottom carbons does not matter. Though there are 8 combinations it draw 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. Structure n is? a. achiral but not meso b. chiral c. meso d. not a -c. What is the relation between structures q and s? a, constitutional isomers b. diastereomers c. enantiomers d. equivalent e. not a.-d. The earliest literature for the optical rotation of a pure enantiomer of a chiral stereoisomer structures m-t lists a specific rotation of 7.35degree. If a more recent gives a specific rotation of 10.3 degree for the same pure enantiomer, assuming this latter rotation is correct, what was the % composition 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 a. (1 + 7.35/10.3) times 100% b (1 - 7.35/10.3) times 100% c. (I+7.35/10.3) times 50% d. 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. 1 d. L e. not a. -d. How many unique compounds (stereoisomers) are in the family of structures m through a. 2 b. 4 c. 6 d. 8 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 repeat

Explanation / Answer

Answers are as follows:

1. (d)

2. (a)

3. (b)

4 . (a)

5. (d)

6. (b)

7.(a)

8. (a)

9. there must be 8 in total in all CNMR.

10. (d)

11. (C)

12. (A)

13. (c)

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