Q. 74.3( 4 Votes )

Identify the reac

Answer :

(a) The reaction given above is Hell - Volhard Zelinsky Reaction or α - halogenation reaction.


The product formed is 2 - bromo propanoic acid.


Explanation:



One of the alpha carbons is substituted with the halogen.


(b) The reaction given above is Rosenmund reaction.


The product formed is Benzaldehyde.


Explanation:



Rosenmund reaction is a hydrogenation reaction in which acyl chloride is converted to an aldehyde in the presence of hydrogen gas and Lindlar catalyst(Pd - BaSO4)


OR


The products of the cross aldol condensation of ethanal and propanal are


pent-2-enal and 2-Methyl-but-2-enal


Their IUPAC structures are:


Explanation:


Aldehydes and ketones are having at least one hydrogen undergo a reaction in the presence of a dilute alkali as a catalyst to form β-hydroxy aldehydes (aldol) or β-hydroxy ketones (ketol), respectively. This is known as the Aldol reaction.



The aldol and ketol readily lose water to give α,β-unsaturated carbonyl compounds which are aldol condensation products.



Aldol condensation in between two different aldehydes or ketones is called cross-aldol condensation reaction.


Shown here is only the cross aldol products as per the question


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