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Reference.org
Propionaldehyde
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<p>Propionaldehyde or propanal is the <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula CH3CH2CHO. It is the 3-carbon <a href="/facts/Aldehyde/xSIRkW03">aldehyde</a>. It is a colourless, flammable liquid with a pungent and fruity odour. It is produced on a large scale industrially. </p>