Are Boron Trihalides Covalent?

Boron trihalides are covalent.

Why are boron trihalides covalent?

Because they are strong Lewis acids, the boron halides act as acid catalysts for several important organic reactions. where rAB is the bond length, rA and rB are the covalent single bond radii of atoms A and B, and χA and χB are the electronegativities of these atoms.

What are boron trihalides?

Boron trihalides, BX₃, are trigonal planar molecules which are (sp)² hybridized. The X–B–X angles are 120°. The boron trihalides are strong Lewis acids; however, the order of relative acid strengths, , is contrary to that expected based on the electronegativities and atomic sizes of the halogen atoms.