Increasing Order of Bond Angles in BF₃, PF₃ and ClF₃

Question:
The correct increasing order for bond angles among BF₃, PF₃ and ClF₃ is:

Correct Answer: ClF₃ < PF₃ < BF₃

Explanation (VSEPR Theory)

According to VSEPR theory, bond angle depends on molecular geometry and the number of lone pairs on the central atom.

BF₃:
Trigonal planar geometry with no lone pairs. Bond angle ≈ 120° (maximum).

PF₃:
Trigonal pyramidal geometry with one lone pair. Lone pair–bond pair repulsion reduces bond angle (< 109.5°).

ClF₃:
T-shaped geometry with two lone pairs on chlorine. Strong lone pair–lone pair repulsion causes minimum bond angle.

Hence, the increasing order of bond angles is:

ClF₃ < PF₃ < BF₃

Related JEE Main Chemical Bonding Questions