Which of the following can undergo a disproportionation reaction on heating with concentrated alkali?

Which of the following reagents can be used to distinguish between an aldehyde and a ketone?

The reddish brown precipitate formed in the Fehling's test for aldehydes $(RCHO)$ is due to the formation of

Which of the following represents the correct order of reactivity towards nucleophilic addition reactions?

Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?

Compound '$A$' (molecular formula $C_3H_8O$) is treated with acidified potassium dichromate to form a product '$B$' (molecular formula $C_3H_6O$). '$B$' forms a shining silver mirror on warming with ammoniacal silver nitrate. '$B$' when treated with an aqueous solution of $H_2NCONHNH_2 \cdot HCl$ and sodium acetate gives a product '$C$'. Identify the structure of '$C$.