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The BCl ₃ is a planar molecule where as NCl ₃ is pyramidal, because

Options

  1. AB - Cl bond is more polar than N - Cl bond
  2. BN - Cl bond is more covalent than B - Cl bond
  3. Cnitrogen atom is smaller than boron atoms
  4. DBCl ₃ has no lone pair but NCl ₃ has a lone pair of electrons.

Correct answer

D. BCl ₃ has no lone pair but NCl ₃ has a lone pair of electrons.

Step-by-step solution

No lone pair of electron is available in BCl ₃ . One lone pair of electron is available on N-atoms, it occupies a corner in the tetrahedral arrangement. Therefore, NCl ₃ appears pyramidal in shape.

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