Question: Increased single-bond character in a carbonyl group is associated with a decreased carbon- oxygen stretching frequency. Among the three compounds benzaldehyde, 2,4,6 trimethoxybenzaldehyde, and 2,4,6-trinitrobenzaldehyde,

Increased "single-bond character" in a carbonyl group is associated with a decreased carbon- oxygen stretching frequency. Among the three compounds benzaldehyde, 2,4,6 trimethoxybenzaldehyde, and 2,4,6-trinitrobenzaldehyde, which one will have the lowest frequency carbonyl absorption? Which one will have the highest?

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