Answer
The lewis structure is drawn the way the molecular formula is written.
2) In the B-F bonds the dipole moment is towards fluorine. The molecular dipole is canceled by each dipole moment.
3) The compound has a zero dipole moment.
Work Step by Step
1) The Fluorines are attached to Boron in the center. There are 3 lone pairs on each fluorine.
2) In the B-F bonds the dipole moment is towards fluorine because fluorine is more electronegative than Boron. Since the dipole moments cancel each other, the the molecular dipole is canceled.
3) The compound has a zero dipole moment because the dipole moments are canceled.
