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Chemical Bonding and Molecular Structure question

2020 · 2 Sep · Shift 1 · Q17
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Chemical Bonding and Molecular Structure question

2020 · 2 Sep · Shift 1 · Q17

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
If AB4AB_4AB4​ molecule is a polar molecule, a possible geometry of AB4AB_4AB4​ is
  1. A
    Tetrahedral
  2. B
    see-saw
  3. C
    Square pyramidal
  4. D
    Square planar
View written solutionFree

Correct answer: B

  1. We need a possible geometry for an AB4AB_4AB4​ molecule that is polar.

  2. Consider each option:

    A. Tetrahedral

    • Shape of AB4AB_4AB4​ with four identical BBB atoms arranged symmetrically.
    • All bond dipoles cancel due to symmetry.
    • Hence, tetrahedral AB4AB_4AB4​ is non-polar.

    B. See-saw

    • This comes from trigonal bipyramidal electron geometry with one lone pair: AX4EAX_4EAX4​E.
    • The shape is asymmetric.
    • Bond dipoles do not cancel completely.
    • Hence, see-saw molecules are polar.

    C. Square pyramidal

    • This geometry corresponds to AX5EAX_5EAX5​E, i.e. generally five bonded atoms around the central atom.
    • So it is not a geometry of AB4AB_4AB4​.

    D. Square planar

    • This corresponds to AX4E2AX_4E_2AX4​E2​.
    • With four identical surrounding atoms, the geometry is highly symmetric.
    • Bond dipoles cancel.
    • Hence, square planar AB4AB_4AB4​ is non-polar.

  3. Therefore, the possible geometry of polar AB4AB_4AB4​ is:

see-saw\boxed{\text{see-saw}}see-saw​

  1. Comparing with the stored correct answer:
  • Stored correct answer: B
  • Derived answer: B
  • They agree.
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