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JEE MainChemistryChemical Bonding and Molecular Structure

Which of the following statements comparing the properties of two chemical species is correct?

Options

  1. A[ NiCl ₄]²⁻ and [ PtCl ₄]²⁻ are isostructural and both are paramagnetic.
  2. BNO ₂ and BF ₃ are both planar species that possess an incomplete octet around their central atoms.
  3. CSF ₄ and XeF ₄ both possess expanded octets and the same number of lone pairs on their central atoms.
  4. DNH ₄⁺ and AlCl ₃ (monomer) both have complete octets and are tetrahedral.

Correct answer

B. NO ₂ and BF ₃ are both planar species that possess an incomplete octet around their central atoms.

Step-by-step solution

Let us evaluate each statement: Option 1: [ NiCl ₄]²⁻ contains Ni ²⁺ (3d ^8 ) with weak field Cl ⁻ ligands, resulting in sp^3 hybridization (tetrahedral) and 2 unpaired electrons (paramagnetic). [ PtCl ₄]²⁻ contains Pt ²⁺ (5d ^8 ). Since it is a 5d metal, it forms a low-spin dsp^2 complex (square planar) and is diamagnetic. They are neither isostructural nor both paramagnetic. Option 2: NO ₂ is a bent molecule (which is planar as it has only 3 atoms) with 7 valence electrons around nitrogen (incomplete octet). BF ₃

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