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What is the reaction of formaldehyde with conc.H2SO4?

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There is no reaction between formaldehyde and Con. H2SO4 however, the mixture of Formaldehyde with concentrated H2SO4 is a famous Marquis reagent which is used to identify alkaloids. read more

There is no reaction between formaldehyde and Con. H2SO4 however, the mixture of Formaldehyde with concentrated H2SO4 is a famous Marquis reagent which is used to identify alkaloids. The method for producing the reagent is the addition of 100 mL of concentrated (95–98%) sulfuric acid to 5 mL of 40% formaldehyde. read more

(1) that the reaction is preferably called an elimination, rather than a dehydration, although I personally like the term dehydration because it emphasizes the strong dehydrating power of H2SO4 that is unfotunately forgotten too often by undergraduates. read more

Best Answer: Formaldehyde will under go canizarro's reaction which is essentially the auto oxidation-reduction of formaldehyde in the presence of concentrated NaOH. Formic acid,HCOOH and methanal, CH3OH are both produced by the oxidation and reduction of formaldehyde,HCHO. read more

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