Weblink 12.4 View and rotate the molecules shown in Fig. 12.26

Epoxide A has a mirror plane and is therefore not chiral. Epoxides B and C are enantiomers of one another, even though they possess a rotational axis.

Cyclobutane D has two mirror planes, and so is not chiral. Cyclobutane E has a centre of inversion, and is also achiral.

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