Question

Which one of the following molecules is planar?

• A. $NF_3$
• B. $NCl_3$
• C. $PH_3$
• D. $BF_3$

Answer 1

Answer: (D)

$BF_3$

Answer 2

$BF_3$ has triangular planar arrangement.
There identical vectors acting in outward direction, at equal
angles in a plane, cancel each other giving zero resultant,
hence non-polar.