Textbook Question
Draw structures for the following:
e. two achiral stereoisomers of 3,4,5-trimethylheptane
5. Chirality
Test 1:Plane of Symmetry
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Which of the following molecules has a plane of symmetry?
A
trans-1,2-dichloroethene
B
2-butanol
C
cyclohexane in chair conformation
D
2,3-dimethylbutane
Verified step by step guidance1
Understand the concept of a plane of symmetry: A plane of symmetry in a molecule is an imaginary plane that divides the molecule into two mirror-image halves.
Examine trans-1,2-dichloroethene: Visualize the molecule and note that the chlorine atoms are on opposite sides of the double bond, creating a plane of symmetry through the double bond and the carbon atoms.
Analyze 2-butanol: Consider the structure of 2-butanol, which has an asymmetric carbon atom (chiral center), making it impossible to have a plane of symmetry.
Evaluate cyclohexane in chair conformation: In the chair conformation, cyclohexane does not have a plane of symmetry due to the staggered arrangement of hydrogen atoms.
Inspect 2,3-dimethylbutane: Visualize the molecule and note that the presence of two methyl groups on adjacent carbon atoms disrupts any potential plane of symmetry.
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