Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Suggest reasons why the B–F bond lengths in BF₃ (130 pm) and BF₄⁻ (143 pm) differ.

Options

  1. AThe presence of the additional F atom in BF₄⁻ leads to increased electron density around the boron atom, causi
  2. BThe repulsion between the lone pair on the central boron atom in BF₄⁻ causes a longer bond compared to BF₃.
  3. CThe electronegativity of boron is lower than that of fluorine, resulting in a longer bond length in BF₄⁻.
  4. DThe symmetry of the BF₄⁻ ion leads to shorter bond lengths compared to the asymmetry of BF₃.

Correct answer

B. The repulsion between the lone pair on the central boron atom in BF₄⁻ causes a longer bond compared to BF₃.

Step-by-step solution

Correct Option is : (B) The repulsion between the lone pair on the central boron atom in BF₄⁻ causes a longer bond compared to BF₃.

Practice p Block Elements (Group 15, 16, 17 & 18) on Quantrex Academy →

More from p Block Elements (Group 15, 16, 17 & 18)

Identify the incorrect statement from the following : 2026Given below are two statements: Statement-I : Heating NaCl with concentrated H₂ SO₄ and MnO₂ results in oxidation of Mn. Statement-II : Heating NaI with concentrated H₂ SO₄ and MnO 2026Given below are two statements: Statement I : Like nitrogen that can form ammonia, arsenic can form arsine. Statement II : Antimony cannot form antimony pentoxide. In the light of 2025Match List - I with List-II array llll & List-I & & List-II . & XeO ₃ & I. & sp ^3 ~d , linear . & XeF ₂ & II. & sp ^3 ; pyramidal . & XeOF ₄ & III. & sp ^3 ~d ^3 ; distorted octah 2025Among Group 16 elements, which one does NOT show -2 oxidation state? 2024Identify the incorrect statement. 2024The products A and B obtained in the following reactions, respectively, are aligned & 3 ROH + PCl ₃ 3 RCl + A & ROH + PCl ₅ RCl + HCl + B aligned 2024Given below are two statements: Statement I: The boiling point of hydrides of Group 16 elements follow the order H ₂ O H ₂ Te H ₂ Se H ₂ ~S . Statement II: On the basis of molecula 2024 Full p Block Elements (Group 15, 16, 17 & 18) list All NEET PYQs