JEE Main · 2021 · Shift-ImediumBOND-085

Which of the following are isostructural pairs? A. SO42- and CrO42- B. SiCl4 and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3

Chemical Bonding · Class 11 · JEE Main Previous Year Question

Question

Which of the following are isostructural pairs?

A. SO42−\mathrm{SO_4^{2-}} and CrO42−\mathrm{CrO_4^{2-}} B. SiCl4\mathrm{SiCl_4} and TiCl4\mathrm{TiCl_4} C. NH3\mathrm{NH_3} and NO3−\mathrm{NO_3^-} D. BCl3\mathrm{BCl_3} and BrCl3\mathrm{BrCl_3}

Options
  1. a

    A and C only

  2. b

    B and C only

  3. c

    A and B only

    ✓
  4. d

    C and D only

Correct Answerc

A and B only

Detailed Solution

🧠 Isostructural = same geometry (both shape and bond arrangement). Compare each pair.

A. \ceSO42−\ce{SO4^{2-}} and \ceCrO42−\ce{CrO4^{2-}}: Both are tetrahedral \ceMO42−\ce{MO4^{2-}} species with identical symmetry → isostructural ✓

B. \ceSiCl4\ce{SiCl4} and \ceTiCl4\ce{TiCl4}: Both are tetrahedral \ceMCl4\ce{MCl4} species (both Si and Ti form 4 bonds, 0 LP) → isostructural ✓

C. \ceNH3\ce{NH3} and \ceNO3−\ce{NO3^-}: \ceNH3\ce{NH3} is pyramidal (N: 3 bonds + 1 LP); \ceNO3−\ce{NO3-} is trigonal planar (N: 3 bonds + 0 LP) → not isostructural ✗

D. \ceBCl3\ce{BCl3} and \ceBrCl3\ce{BrCl3}: \ceBCl3\ce{BCl3} is trigonal planar (B: sp², 0 LP); \ceBrCl3\ce{BrCl3} is T-shaped (Br: sp³d, 2 LP) → not isostructural ✗

Answer: (c) A and B only\boxed{\text{Answer: (c) A and B only}}

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