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If they give bromine water test, what do they form?

I think that aldehydes will get oxidised and so decolourise bromine water but I don't know if that happens in normal conditions.

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closed as off-topic by Jon Custer, aventurin, Mithoron, M.A.R., Todd Minehardt Apr 12 '18 at 23:50

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    $\begingroup$ Think about how readily aldehydes enolise $\endgroup$ – Waylander Apr 12 '18 at 16:11
  • $\begingroup$ Are you saying that they are quite reactive and hence might bromine water? $\endgroup$ – FreakyLearner Apr 12 '18 at 17:06
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    $\begingroup$ Possible duplicate of Does Br2/H2O oxidize all aldehydes? $\endgroup$ – Mithoron Apr 12 '18 at 19:25
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The answer is yes. Aldehydes will decolourise bromine water.

The oxidation of aldehydes to acids is discussed in this answer Does Br2/H2O oxidize all aldehydes?

In addition alpha-bromination of the aldehyde via the acid catalysed bromination of the enol is a well-documented process. https://chem.libretexts.org/LibreTexts/Athabasca_University/Chemistry_360%3A_Organic_Chemistry_II/Chapter_22%3A_Carbonyl_Alpha-Substitution_Reactions/22.03_Alpha_Halogenation_of_Aldehydes_and_Ketones

http://www.chem.ucalgary.ca/courses/350/Carey5th/Ch18/ch18-3-1.html

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