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How many compounds among the following have a stereoisomer that is achiral ? (a) (i) 2,3-dichlorobutane (ii) 2,3-dichloropentane (iii) 2,3-dichloro-2,3-dimethylbutane (b) (i) 1,2-dimethylcyclobutane (ii) 1,3-dibromocyclobutane (iii) 1,3-dichlorocyclopentane (iv) 1,2-dimethylcyclopentane (c) (i) 2,4-dibromopentane (ii) 2,3-dibromopentane (iii) 1,4-dimethylcyclohexane |
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