NMR in aldehyde

[howtomedicine]

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I was wondering if hydrogen b in this example would show up in the NMR as a quartet since it's experiencing a magnetic field from the spin of the aldehyde H and the neighboring c hydrogen

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[aldol16]

Yes, it would be a quartet. See the NMR spectrum for propionaldehyde. The coupling constant for B,C is larger than that of A,B (you don't need to know that).