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JEE Main2018ChemistryChemical Bonding and Molecular StructureActual

The decreasing order of bond angles in BF 3 , NH 3 , PF 3 and I 3 - is:

Options

  1. AI 3 - >   BF 3 >   NH 3 >   PF 3
  2. BBF 3 >   I 3 - >   PF 3 >   NH 3
  3. CBF 3 >   NH 3 >   PF 3 > I 3 -
  4. DI 3 - >   NH 3 >   PF 3 >   BF 3

Correct answer

A. I 3 - >   BF 3 >   NH 3 >   PF 3

Step-by-step solution

Bond angle = 120 o ,   s p 2 Bond angle = 107 o ,   s p 3 (1 lone pair) Bond angle ≈ 92 o When central atom size increases, bond angle decreases s p 3 ,   N H 3 > P F 3 Bond angle = 180 o ,   s p 3 d

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