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Manipal MET2016ChemistryChemical Bonding and Molecular Structure

Which of the following compounds has lowest boiling point?

Options

  1. AKCl
  2. BCuCl
  3. CCuCl ₂
  4. DCsCl

Correct answer

C. CuCl ₂

Step-by-step solution

According to Fajan's rule, as the size of cation decreases, it polarising power increases. Hence, K ⁺ and Cs ⁺ having bigger cations contain less polarising power. Cu ²⁺ polarise Cl ⁻ ions more than Cu ⁺ due to its smaller size. Therefore, CuCl ₂ has more covalent character and hence, its boiling point is less.

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