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Kaplan Home Review Organic Chemistry Ch. 2 Discrete Practice Questions:
9. Consider (E)-2-butene and (Z)-2-butene. This is a pair of what type(s) of isomers?
I. Cis-trans isomers
II. Diastereomers
III. Enantiomers
A. I only
B. II only
C. I and II only
D. I and III only
The answer is C. Obvi E and Z 2-butene are cis-trans isomers but how in the poop are they diastereomers? I thought diasteromers, by definition, had to have two different chiral centers. There are no chiral centers in 2-butene.
HALP. thx
9. Consider (E)-2-butene and (Z)-2-butene. This is a pair of what type(s) of isomers?
I. Cis-trans isomers
II. Diastereomers
III. Enantiomers
A. I only
B. II only
C. I and II only
D. I and III only
The answer is C. Obvi E and Z 2-butene are cis-trans isomers but how in the poop are they diastereomers? I thought diasteromers, by definition, had to have two different chiral centers. There are no chiral centers in 2-butene.
HALP. thx