I need help reviewing question 4-13 and if an explanation could be provided as t

Question

I need help reviewing question 4-13 and if an explanation could be provided as to why the answer choice is the correct one. CHEM 2324 Exam 4 Version B Name: May 11, 2017 UTEP ID organic iz no Exam 4 retake homework is due tomorrow, Friday, May 12, before 5 pm through hrpa exceptions or excuses. Expect an email from me this evening. nn your scantron ID, and Structures m through for 10 are all the combinations of left and right OH groups on the center 3 carbons of a Fischer projection. Remember and left on the top and bottom carbons that drawing OH groups right or does not matter. Though there are 8 draw it Lot megn that they represent 8 different compounds. N How many total R andrcenters are in structure m? Chiral and hiral centers are called stereogenic centers because switching two groups on either leads to another stereoisomer e, not a -d. d, not a -c. b. chiral 2. Structure n is? a. ral but not meso 3. What is the relation between structures g and s? (Hint: Determine the stereochemical configuration (Rs. of both compounds.) e, not a -d. valent b, diastereomers constitutional 4. The earliest literature reference for the optical rotation of a pure enantiomer of a chiral stereoisomer ofstructures m-t lists a specific rotation of7.35 a a more recent reference gives a specific rotation of 10.3 for the same pure f enantiomer, assuming this latter rotation is correct, what was the composition of the major enantiomer of the 7.35° 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)x 100% 5. Structure o for sure is? Structure o is a common sugar substitute and is poisonous to dogs e, not a -d. 6. How many unique compounds (stereoisomers are in the family of structures m through I. (Hint: Do not depend on formulas. Name all the compounds to find out!) d. 8 e, not a 7. Structures p and r should have the same 15C NMR? 8. Structures m and t should have the same taste? false 9-13. How many l CNMR signals should the following compounds have? Answers may be repeated. 9. Structure 2 0, Structure p b, 2

Explanation / Answer

Answer-

1) d 3

2) The structure n is achiral but not meso.

3) The structures q and s are enantiomers.

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