6. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?
(A) 1,1-dimethylcyclohexane
(B) cis-1,2-dimethylcyclohexane
(C) trans-1,2-dimethylcyclohexane
(D) trans-1,3-dimethylcyclohexane

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統計： A(0), B(0), C(4), D(1), E(0) #2999392