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JEE Main202622 January 2026Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Two p-block elements X and Y form fluorides of the type EF ₃ . The fluoride compound XF ₃ is a Lewis acid and YF ₃ is a Lewis base. The hybridizations of the central atoms of XF ₃ and YF ₃ respectively are

Options

  1. Asp ² and sp ³
  2. BBoth sp ³
  3. Csp ³ and sp ²
  4. DBoth sp ²

Correct answer

A. sp ² and sp ³

Step-by-step solution

XF₃ is a Lewis acid, indicating the central atom X lacks a complete octet and can accept electron pairs. This is characteristic of Boron (B). Boron in BF₃: Valence electrons: 3 Steric number: 3 (three B-F bonds, no lone pairs) Geometry: Trigonal planar Hybridization: sp² YF₃ is a Lewis base, indicating the central atom Y has lone pair(s) available to donate. This is characteristic of Nitrogen (N). Nitrogen in NF₃: Valence electrons: 5 Steric number: 4 (three N-F bonds + one lone pair) Geometry: Trigonal pyramidal H

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