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MHT CET202525 Apr 2025Evening ShiftChemistryChemical Bonding and Molecular StructureActual

Which of the following is more polar?

Options

  1. AH ₂ S
  2. BNH ₃
  3. CNF ₃
  4. DCHCl ₃

Correct answer

B. NH ₃

Step-by-step solution

Molecular polarity depends on bond electronegativity differences and molecular geometry, with the overall dipole moment determined by the vector sum of individual bond dipoles. H ₂ S exhibits bent geometry with bond dipoles that do not cancel, yielding 0.97 D . NH ₃ 's trigonal pyramidal structure and highly polar N-H bonds produce a large dipole moment of 1.47 D , enhanced by the lone pair contribution. For NF ₃ , the opposing directions of the N-F bond dipoles and lone pair dipole partially cancel, resulting in 0

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