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COMEDK2024ChemistryChemical Bonding and Molecular StructureActual

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below. Assertion (A): A molecule of SF ₄ is see-saw shaped, while that of CIF ₃ is T-shaped. Reason(R): SF₄ has two lone pair of electrons. But CIF₃ has one pair of electrons.

Options

  1. AAssertion (A) is correct but Reason (R) is incorrect
  2. BAssertion (A) and Reason (R) are correct
  3. CAssertion (A) is incorrect but Reason (R) is correct
  4. DBoth Assertion (A) and Reason (R) are incorrect

Correct answer

A. Assertion (A) is correct but Reason (R) is incorrect

Step-by-step solution

In SF ₄ , the central sulfur atom has 6 valence electrons. It forms 4 bonds with fluorine atoms, leaving 2 electrons, which constitute 1 lone pair. The steric number is 4 + 1 = 5 , corresponding to a trigonal bipyramidal electron geometry. With one lone pair in the equatorial position, the molecular geometry is see-saw shaped. Thus, the assertion regarding SF ₄ is correct, but the reason stating it has two lone pairs is incorrect. In CIF ₃ , the central chlorine atom has 7 valence electrons. It forms 3 bonds with f

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