JEE Main · 2021 · Shift-IIeasyPB12-024

The correct order of bond dissociation enthalpy of halogens is:

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

The correct order of bond dissociation enthalpy of halogens is:

Options
  1. a

    F2>Cl2>Br2>I2\mathrm{F_2 > Cl_2 > Br_2 > I_2}

  2. b

    Cl2>F2>Br2>I2\mathrm{Cl_2 > F_2 > Br_2 > I_2}

  3. c

    I2>Br2>Cl2>F2\mathrm{I_2 > Br_2 > Cl_2 > F_2}

  4. d

    Cl2>Br2>F2>I2\mathrm{Cl_2 > Br_2 > F_2 > I_2}

Correct Answerd

Cl2>Br2>F2>I2\mathrm{Cl_2 > Br_2 > F_2 > I_2}

Detailed Solution

Strategy: Match noble gas species with their geometry or hybridization.

Step 1: Geometric Identification

  • \ceXeF2\ce{XeF2} (2 BP + 3 LP): Linear (Hybridization: sp3dsp^3d).
  • \ceXeF4\ce{XeF4} (4 BP + 2 LP): Square Planar (sp3d2sp^3d^2).
  • \ceXeF6\ce{XeF6} (6 BP + 1 LP): Distorted Octahedral (sp3d3sp^3d^3).
  • \ceXeO3\ce{XeO3} (3 BP + 1 LP): Pyramidal (sp3sp^3).

Step 2: Conclusion Matching (A), (B), (C), (D) with the corresponding geometries gives the correct set.

Answer: (Option) [d] [Correct Matching Set]\boxed{\text{Answer: (Option) [d] [Correct Matching Set]}}

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