Carbonyl compounds give different oxidation products with different reagents. Several oxidising agents can be used to oxides carbonyl compound. Ammonical silver nitrate (Tollens' reagent) oxidises aliphitic as well as aromatic aldehydes.
`R-CHOoverset("Tollenes reagent ")rarrR-COOH+Ag("Silver mirror")`
Strong oxidising agents like `KMnO_(4)//H^(+),HNO_(3) K_(2)Cr_(2)O_(7)//H^(+)` oxidise aldehydes as well as ketones. Open chain ketnoes on oxidation give mixture of two carboxylic acids. Oxidation of unsymmetrical ketones takes place acording to Popoff's rule. According to this rule, `alpha` whose bond breks in oxidation always belongs to the alkyl group which has more number of carbons.
Tollens' reagent gives positive test with :

Options

A. RCHO
B. `R-C-=CH`
C. HCOOH
D. all of these

Answer

D