Count the resonance contributors of the nitroacetone anion CH₃-CO-C⁻H-NO₂, in which the negative charge starts on the carbon between the C=O and NO₂ groups.

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Charge on carbon (1), on the acyl oxygen (2), and on each of the two nitro oxygens in the nitronate form (3 and 4). The nitro group itself has two equivalent drawings (O=N and N=O), which adds one more form.

Total = 5.

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