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Formaldehyde (methanal) is a colourless gas, HCHO; r.d. 0.815 (at -20 °C); m.p. -92 °C; b.p. -21 °C. It is the simplest aldehyde, made by the catalytic oxidation of methanol (500 °C; silver catalyst) by air. It forms two polymers: methanal trimer and polymethanal.
Aldehydes are a broad class of organic compounds having the generic formula RCHO, and characterized by an unsaturated carbonyl group (C=O). They are formed from alcohols by either dehydrogenation or oxidation. Their chemical derivation is indicated by the name al(cohol) + dehyd(rogenation). An example of these distinct aromatic compounds is formaldehyde.
Generalic, Eni. "Formaldehid." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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