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

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

A

B F 3 < P F 3 < C l F 3

B

C l F 3 < P F 3 < B F 3

C

P F 3 < B F 3 < C l F 3

D

B F 3 = P F 3 < C l F 3

Answer

C l F 3 < P F 3 < B F 3

Explanation

Solution

  • BF3: Trigonal planar geometry, bond angle = 120°.
  • PF3: Trigonal pyramidal geometry, bond angle < 109.5° (approx. 97.7°).
  • ClF3: T-shaped molecular geometry, bond angle < 90° (approx. 87.5°).

The increasing order of bond angles is ClF3 < PF3 < BF3.