Question

Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that `BF_(3)` has no dipole moment nut `PF_(3)` does ?
A. `BF_(3)` is not spherically symmetrical but `PF_(3)` is
B. `BF_(3)` molecule must be linear
C. The atomic radius of P is larger than that of B
D. The `BF_(3)` molecule must be planar triangular

Answer 1

Correct Answer - D
The B-F bond is polar, yet `BF_(3)` is non-polar because `BF_(3)` has a planar triangular structure.