Final answer:
BF3 (boron trifluoride) has a plane of symmetry due to its trigonal planar shape with three fluorine atoms spaced evenly around the central boron atom.
Step-by-step explanation:
The student asked which of the following molecules has a plane of symmetry. The names for molecules whose structures are nonsuperimposable mirror images of each other are called enantiomers. However, for molecules with a plane of symmetry, consider symmetry in terms of the molecular geometry and the distribution of electrons and bonds around the central atom. High symmetry molecules like BF3 which is trigonal planar, CH4 which is tetrahedral, PF5 which is trigonal bipyramidal, and SF6 which is octahedral, usually have planes of symmetry. These molecules have identical bond polarity and are arranged in such a way that they are nonpolar overall, contributing to their symmetrical nature. Given the examples, BF3 (boron trifluoride) would have a plane of symmetry because it is a trigonal planar molecule where the three fluorine atoms are spaced 120° apart, forming a symmetrical shape around the boron atom at the center.