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Chemical Bonding and Molecular Structure question

2024 · 29 Jan · Shift 1 · Q11
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Chemical Bonding and Molecular Structure question

2024 · 29 Jan · Shift 1 · Q11

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is
  1. A
    electromeric energy
  2. B
    resonance energy
  3. C
    ionization energy
  4. D
    hyperconjugation energy
View written solutionFree

Correct answer: B

  1. Identify the concept involved

    The question asks for the difference in energy between the actual structure and the lowest energy resonance structure of a compound.

  2. Recall the definition

    In molecules showing resonance:

    • No single canonical structure represents the true molecule completely.
    • The real molecule is a resonance hybrid.
    • The resonance hybrid is more stable than any individual canonical structure.

    The extra stabilization is called resonance energy.

  3. Apply the definition

    Therefore,

    Resonance energy=Energy of lowest energy canonical structure−Energy of actual molecule\text{Resonance energy} = \text{Energy of lowest energy canonical structure} - \text{Energy of actual molecule}Resonance energy=Energy of lowest energy canonical structure−Energy of actual molecule

    So, the energy difference mentioned in the question is resonance energy.

  4. Check the options

    • A: electromeric energy — not a standard term for this energy difference.
    • B: resonance energy — correct.
    • C: ionization energy — energy required to remove an electron, unrelated.
    • D: hyperconjugation energy — refers to stabilization due to hyperconjugation, not resonance hybrid vs canonical structure difference.

  5. Final answer

    The correct option is B: resonance energy.

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