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NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice

Which one of the following conversions involve change in both hybridisation and shape?

Options

  1. AC H 4 ⟶ C 2 H 6
  2. BN H 3 ⟶ N H 4 +
  3. CB F 3 ⟶ B F 4 -
  4. DH 2 O ⟶ H 3 O +

Correct answer

C. B F 3 ⟶ B F 4 -

Step-by-step solution

(a) CH 4 → CH 3 - CH 3 4 bp + 0 lp 4 bp 4 bp Hybridisation sp 3 sp 3 sp 3 Structure Tetrahedral Tetrahedral Tetrahedral (b) NH 3 → NH 4 + 3 bp + 1 lp 4 bp Hybridisation sp 3 sp 3 Structure pyramidal tetrahedral (c) BF 3 → BF 4 - 3 bp 4 bp Hybridisation sp 2 sp 3 Structure trigonal tetrahedral planar (d) H 2 O → H 3 O + 2 bp + 2 lp 3 bp + 1 lp Hybridisation sp 3 sp 3 Structure angular Pyramidal Thus conversion of B F 3 into B F 4 - involves change in both hybridisation and shape.

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