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COMEDK2024ChemistryChemical Bonding and Molecular Structure

Which of the following molecules have three bond pairs but different shape? (i) BCl ₃ (ii) H ₂ ~S (iii) PH ₃ (iv) AsF ₅

Options

  1. A(i) and (ii)
  2. B(ii) and (iii)
  3. C(i) and (iii)
  4. D(iii) and (iv)

Correct answer

C. (i) and (iii)

Step-by-step solution

Both BCl ₃ and PH ₃ has 3 bond pairs each but PH ₃⁺ also has one lone pair of electron on P. Therefore BCl ₃ is triangular planar whereas PH ₃ has trigonal pyramidal shape.

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