Write appropriate structural formulas for
(a) A cyclic molecule that is a constitutional isomer of cyclohexane,
(b) Molecules with the formula C6H12 that contain one ring and that are enantiomers of each other,
(c) Molecules with the formula C6H12 that contain one ring and that are diastereomers of each other,
(d) Molecules with the formula C6H12 that contain no ring and that are enantiomers of each other,
(e) Molecules with the formula C6H12 that contain no ring and that are diastereomers of each other.