Question

Reaction by which Benzaldehyde cannot be prepared:-

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

(b). Etard Reaction: The Etard reaction involves the direct oxidation of an heterocyclic or aromatic bound methyl to an aldehyde using chromyl chloride.

(c). Rosenmund Reaction: It is the process of hydrogenation during which an acyl chloride is selectively reduced to an aldehyde in presence of Pd and $BaS{O}_4$.

(d). Gatterman Koch Reaction: This reaction refers to a Friedel–Crafts acylation reaction in which a Friedel–Crafts catalyst, hydrochloric acid, and carbon monoxide are used to produce benzaldehyde from benzene..

(a). In presence of Zn-Hg and conc. HCl , reduction of aldehyde and ketone occurs but carboxylic group remains unaffected.