Answer :

Propene on reaction with H2O/H+ follows Markonikov’s addition (i.e. H adds to the C having more no. of H across the double bond and OH adds to the C having less no. of C across double bond) and forms propan-2-ol which on further oxidation with CrO3 gives corresponding ketone which is acetone.

Propanoic acid is halogenated at position on treatment with Cl2 in the presence of small amount of red phosphorus to give chloropropanoc acid and this reaction is known as Hell Volhard Zelinsky reaction. When chloropropanoc acid is treated with aq NaOH, 2-hydroxypropanoic acid is obtained.


(a) Etard reaction

Toluene on controlled oxidation using chromyl chloride in CS2 oxidises methyl group to a chromium complex, which on hydrolysis gives benzaldehyde. This is called Etard reacton.


(b) Wolff-Kishner reduction

The carbonyl group of aldehydes and ketones is reduced to CH2 group on treatment with hydrazine followed by heating with sodium or potassium hydroxide in high boiling solvent such as ethylene glycol is Wolff-Kishner reduction.

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