215W16_E3_key_with_stats

215W16_E3_key_with_stats - number of students Dear Chem 215...

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Dear Chem 215 students, The exam statistics are provided below. This represents a great job on exam 3! Average: 90/120 (75%) Standard deviation: 19.2 Median 93/120 high: 120/120, low: 23/120 number of students: 792 The scores are now posted on CTools under gradebook. A pdf copy of your exam will be posted to your M-­‐Box account, probably by the end of the day Friday. Instructions on retrieving your exam pdf may be found at: < https://umich.app.box.com/exam-­‐scan-­‐student-­‐guide >. An answer key and a regrade request form are both posted on CTools under resources. Please download the regrade request form and follow the instructions if you request a re-­‐grade or math error correction. Deadline for requests for exam 3 is April 22. 0 20 40 60 80 100 120 140 160 180 200 number of students
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Chemistry 215 (Winter 2016) Exam 3 Name: ____________________________ page 1 I. (30 points). A . D-Galactose is the C-4 epimer of D-glucose. On the templates below, draw the structures of the acyclic form of D-galactose and the β -anomer of D-galactopyranose. Clearly show stereochemistry and orientation of the bonds. O H HO O 6 6 O H HO OH OH OH OH D-mannose O H HO OH OH OH OH O H HO OH OH OH OH compound E compound F Compound E is: ___ an anomer of D-mannose ___ an L sugar other than L-mannose ___ L-mannose ___ the enantiomer of D-mannose ___ a diastereomer of D-mannose ___ an epimer of D-mannose Compound F is: ___ an anomer of D-mannose ___ an L sugar other than L-mannose ___ L-mannose ___ the enantiomer of D-mannose ___ a diastereomer of D-mannose ___ an epimer of D-mannose B . Consider the three structures below, and check all of the correct statements in the boxes below. 6 6 O HO HO OH OH O (2 equiv) TsOH (catalytic amount) C . The following reaction provides one major diastereomer due to both ring strain and the anomeric effect.
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