Identify the reaction and write the IUPAC name of the product formed:

(a)

(b)

OR

Write the structures and IUPAC names of the cross aldol condensation products only of ethanal and propanal

(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