Question

Which of the following is not a viable way to synthesize a carboxylic acid?

Grignard reaction using carbon dioxide with subsequent neutralization

Oxidation of a primary alcohol

Hydrolysis of an acid anhydride

Hydrolysis of an acyl chloride

Hydrolysis of an amide

Oxidation of an aldehyde

Hydrolysis of an ester

Hydrolysis of a nitrile

Oxidation of a ketone