31. Which is the IUPAC name for the following cycloalkane?
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(A) 2,4-dimethyl-1-ethylcyclopentane
(B) 1,3-dimethyl-5-ethylcyclopentane
(C) 1-ethyl-2,4-dimethylcyclopentane
(D) 1-ethyl-3,5-dimethylcyclopentane

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