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COMEDK2023Evening ShiftChemistryChemical Bonding and Molecular StructureActual

In the following question, Assertion (A) is given followed by a statement of Reason (R). Choose the correct answer. Assertion (A): (2 p_x ), (2 p_y ), ^* (2 p_x ), ^* (2 p_y ) molecular orbitals have one nodal plane each. Reason ( R ) : All the molecular orbitals formed by the sideways overlapping have one nodal plane.

Options

  1. ABoth assertion and reason are true and reason is not the correct explanation of the assertion.
  2. BBoth assertion and reason are true and reason is the correct explanation of the assertion.
  3. CAssertion is true but reason is false
  4. DBoth assertion and reason are false

Correct answer

D. Both assertion and reason are false

Step-by-step solution

Assertion (A): (2p_x) and (2p_y) are bonding MOs formed by constructive sideways overlap — they have one nodal plane (the plane containing the internuclear axis). However, ^*(2p_x) and ^*(2p_y) are antibonding MOs formed by destructive sideways overlap — they have two nodal planes: one containing the internuclear axis and one perpendicular to it between the two nuclei. Since the antibonding MOs have two nodal planes, Assertion (A) is false. Reason (R): Sideways overlapping produces both and ^* MOs. Since ^* orbital

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