Use their planar-ring structures to determine which of the following compounds are chiral. For any that are achiral, indicate whether their individual chair conformations are chiral. Tell how you know. For any achiral compounds, give the relationship of their two chair conformations (identical, conformational enantiomers, or conformational diastereomers).

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H₂C CH3 A CI H₂C B CH3 CI CI CH 3 с CH3