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Answer 1 · 2017-09-19T00:45:58

Diborane is nonpolar because it is a symmetrical molecule.

The structure of diborane is

Diborane

Two of the $H$ $"H"$ atoms act as bridges between the $B$ $"B"$ atoms.

Theoretical calculations show that the partial charges on each atom are:

Thus, there are fairly large $B-H$ $"B-H"$ bond dipoles.

However, the diborane molecule is perfectly symmetrical.

Every $B-H$ $"B-H"$ bond dipole that points in one direction has a counterpart that points in exactly the opposite direction.

Thus, all bond dipoles cancel and diborane is a nonpolar molecule.