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Question

Write chemical equations for the following reactions : 
 (i) Propanone is treated with dilute BaOH2.
(ii) Acetophenone is treated with Zn(Hg)/Conc.HCl
(iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO4


Solution

(i)When propanone is treated with dil.barium hydroxide since it have α hydrogen it will undergo self aldol condensation reaction via 

(ii) Ketone or aldehyde when treated with Zn(Hg)/Conc.HCl
gets reduced to alkane. The carbonyl group gets reduced and this reaction is known as Clemmensen's reduction. 

(iii)H2,Pd/BaSO4 is a typical reagent for Rosenmund reaction which does the selective reduction of acid chloride to aldehyde for benzoyl chloride. The reaction is: 

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