Which of the following molecules has trigonal planar geometry?

• A

  $\mathrm{IF}_3$
• B

  $\mathrm{PCl}_3$
• C

  $\mathrm{NH}_3$
• Correct answer
  D

  $\mathrm{BF}_3$

Solution

$\mathrm{IF}_3$ has bent-T geometery $\mathrm{PCl}_3$ has pyramidal geometery. $\mathrm{NH}_3$ has pyramidal geometry. $\mathrm{BF}_3$ has trigonal planar geometry.

Hence, the correct answer is option: 'D'.