edugen.wileyplus.com Chega.com Return to Blackboard Klein, Organic Chemistry, 3e

Question

edugen.wileyplus.com Chega.com Return to Blackboard Klein, Organic Chemistry, 3e biela I System Announcements n Assignment GO Tutorial: Understanding stereoisomers of Fischer projections fing x Incorrect Of the four structures shown here in Fischer projections, indicate the relationships between (a) and (b), and between (c) and (d)? HO HOH HO CH20H H HO HOH HO 02 A. 8oth pairs are enantiomens B. Both pairs are identical C. (a) and (b) are enantiomers, (c) and (d) are identical 04 O D. (a) and (b) are identical, (c) and (d) are enantiomers Study GO TUTORIAL Question Attempts: 2 of 3 used I Privacy Polky1 2000-2017 John Wiley& Sons. Inc. All Rights Reserved. A Division of John Wiley & Sons Ins

Explanation / Answer

Q1

Reclal that enantiomer = mirro images

if you "fix" a line between the fisher projections, then if they are "mirror images 2they are enantiomers, otherwise, they are "identical"

a and b are enantiomers, since they are mirror iamges

c and d are enantimoers as well, since they are enantiomers

Therefore

choose "A"

Q2

Identify chiral center:

two carbons

since H and CH3 are similar, then this has 2 chiral carbons BUT the whole molecule is not chiral since the constituents repeat

therefore, this is the SAME compound

Q3

Chiral centers on each:

2

R/S configurations:

these are NOT mirror images

they are NOT the same compounds since not R/S configuration is the same

therefore

these are DIASTEREOMERS

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