Structures m through t are for questions 1 through 10 and are all the combinatio
ID: 528733 • 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 a Fischer projection. Remember that drawing OH groups right 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. 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 degree 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 (1+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 Q is a common sugar substitute and is poisonous to dogs. a. d b. D c. l d. L e. not a.-d. How many unique compounds (stereoisomers) are in the family of structures m through t. a. 2 b. 4 c. 6 d. 8 e. not a.-d. Structures p and t 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 ___ Structure ___ a. 1 b. 2 c. 3 d. 4 e. not a.-d.Explanation / Answer
1. Number of R and r centers in m,
b. 1
2. Structure n is,
b. chiral
3. structure q and s are,
c. enantiomers
4. the percentage of major enantiomer would be,
e. not a-d
5. Structure o is,
c. l
6. unique compounds,
d. 8
7. Structure p and r have same NMR
b. False
8. structure m and t should have same taste,
a. true