Resonance and Formal Charge

AP Chemistry· difficulty 3/5

The carbonate ion CO₃²⁻ has three equivalent resonance structures. All three C-O bonds are

  • A

    Double bonds

  • B

    Single bonds

  • C

    Triple bonds

  • D

    Equivalent — average bond order ~ 4/3 (between single and double)

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Explanation

Resonance delocalizes the double-bond character across all three C-O bonds; experimental bond lengths are equal and intermediate.

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