Identify the reaction so that carbonyl group of aldehydes and ketones is reduced to methylene group on treatment with Zinc-amalgam and concentrated hydrochloric acid.

Step-by-step solution

The reaction characterized by reduction of a carbonyl group to a methylene group using zinc–amalgam and concentrated HCl is known as the Clemmensen reduction . In comparison, the Wolf–Kishner reduction employs hydrazine and a strong base such as KOH or NaOH ; , the Stephan reaction converts nitriles to aldehydes using stannous chloride and hydrochloric acid followed by hydrolysis, while the Étard reaction oxidizes a methyl group attached to an aromatic ring to an aldehyde using chromyl chloride. The correct answer