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JEE Main · 2023 · 01 Feb 2023 · Shift 1 · General Organic Chemistry

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Resonance in carbonate ion is

Which of the following is true?
  1. (A)It is possible to identify each structure individually by some physical or chemical method.
  2. (B)All these structures are in dynamic equilibrium with each other.
  3. (C)Each structure exists for equal amount of time.
  4. (D) has a single structure i.e., resonance hybrid of the above three structures.✓ Correct

Answer: (D)

Solution

The three structures drawn for the carbonate ion are resonance forms, not separate species. Resonance forms are imaginary contributing structures that cannot be isolated or distinguished, and they do not interconvert or exist for definite intervals of time. The real carbonate ion is a single, delocalised entity, the resonance hybrid of the three drawings, in which all three carbon-oxygen bonds are equivalent and the negative charge is shared equally. Thus the carbonate ion has a single structure that is the resonance hybrid of the three contributing forms.

JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Single correct option

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