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Although aldehydes are easily oxidisable...

Although aldehydes are easily oxidisable, propanal can conveniently be prepared by oxidation of propanol by acidified potassium dichromate. Why ?

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The aldehydes can be conveniently oxidised to their respective acids only if they are not removed from the reaction mixture during preparation . As the boiling point of propanal is low (323K) , it is conveniently distilled out during the reation . This avoids its further oxidation.
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Carbonyl compounds give different oxidation products with different reagents .Several oxidising agents can be used to oxidise carbonyy compounds .Ammonical silver nitate (tollens reagent ) oxidises aliphatic as well as aromatic aldehydes . R-CHO overset("Tollens reagents ") to R-COOh +Ag (silver mirror ) strong oxidatising agents like KMnO_4 //H^+ ,HNO_3 ,K_2 Cr_2 O_7 //H^+ oxidise Aldehydes as well as ketons . open chain ketons in oxidation give mixture of two carbonylic acids . oxidation as well as ketons of unsymmetrical ketons takes place according to popoff's rule .According to this rule alpha - carbon whose bond breaks in oxidation always belongs to the alkyl group which has more number of carbons 2 methyl cyclohexanone in oxidation wil give

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