4-Chlorobenzaldehyde + KOH,H+ >> 4-Chlorobenzyl alcohol +4-Chlorobenzoic acid Pu

Question

4-Chlorobenzaldehyde + KOH,H+ >> 4-Chlorobenzyl alcohol +4-Chlorobenzoic acid

Purpose: This experiment illustrates the simultaneous oxidation andreduction of an aromatic aldehyde to form the corresponding benzoicacid and benzoyl alcohol.

1. In this experiment, the alkaline phase was diluted with water.Then it was acidified by concentrated hydrochloric acid. Discussthe acidification of the alkaline phase. How does it help in theisolation of the carboxylic acid product? Use an equation to helpexplain this point.

2. Think about the possibility of the alcohol product reacting withmethanolic KOH. How would this effect the purity of the acidproduct? How could you tell if your acid product was contaminatedin this way? Use an equation to help explain this.

Explanation / Answer

The 4-chlorobenzoic acid formed will be in the form p-Cl-C6H4-COO-K+ salt so addition of HCl the salt gives KCl and p-chlorobenzoicacid this is called regeneration. hope this helps

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