me Class: Date Make-Un Test 12. How many stereoisomers of 3-bromo-2-butanol, CHC
ID: 550536 • Letter: M
Question
me Class: Date Make-Un Test 12. How many stereoisomers of 3-bromo-2-butanol, CHCHOHCHBrCHs, exist? b. 2 c. 13. Which of the following structures has a center of symmetry (i.e, center of inversion)? a. 1 b. 2 c. 3 C, d. 4 14. Which of the following substituents has the highest priority according to the Cahn-Ingold-Prelog system used in assigning R and S configurations? a.-COOH b. -CHO e-CH20H d.-CH3 15. What is the relationship hetween the following pair of structures? CI H l a. They are enantiomens b. They are diastereomers c. The are constitutional isomers d. They are identicalExplanation / Answer
The answers to the above questions are :
12. d
as there are 2 stereocentres and it is not symmetric hence 2^2=4 stereoisomers.
13 d
as the identical groups are at the same distance from the center of the molecule
14 a
it will have the highest priority as it has two O attached to C
15 d
they are identical as the second one is just a rotation around C atom which doesn't affect the structure.
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