Mirror Planes of Symmetry ·If two groups are the same,carbon is achiral. (animation) 。A molecule with an C 1 internal mirror plane cannot be internal mirror plane chiral.* of symmetry (o) Caution!If there is no plane of symmetry, molecule may be chiral or achiral.See if mirror image can be superimposed.= Chapter 5 5 Chapter 5 5 Mirror Planes of Symmetry • If two groups are the same, carbon is achiral. (animation) • A molecule with an internal mirror plane cannot be chiral.* Caution! If there is no plane of symmetry, molecule may be chiral or achiral. See if mirror image can be superimposed. =>