Organic Chemistry

Which of the following compounds can in principle be isolated in optically active form at room temperature? Select all valid choices.
a. trans-1,3-dimethylcyclohexane
b. cis-1-ethyl-3-methylcyclohexane
c. 1,1-dimethylcyclohexane
d. cis-1,4-dimethylcyclohexane

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  1. I would go with answer choice B. In order for something to be optically active, the substance should not have a plane of symmetry. Only answer choice B doesn't have a plane of symmetry.

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  2. The answer was A and B

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  3. Can confirm, it's definitely A and B:
    trans-1,3-dimethylcyclohexane
    and
    cis-1-ethyl-3-methylcyclohexane

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