20. Which one of the following compounds cannot undergo an E2 reaction?
(A) 1-bromo-2,3-dimethylbutane
(B) 2-bromo-2,3-dimethylbutane
(C) 1-bromo-3,3-dimethylbutane
(D) 1-bromo-2,2-dimethylbutane

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統計： A(0), B(0), C(1), D(3), E(0) #2999406