Which of the following pairs do not give the same compound on heating with alkaline potassium permanganate?

Which of the following compound does not undergo aldol condensation?

Identify X in the following reaction.

Semicarbazones undergo acidic nucleophilic addition followed by dehydration to give N-substituted carbonyl derivatives.

Formaldehyde cannot undergo aldol condensation as well as Cannizzaro’s reaction.

What is the correct order of pKa values of the following acids?

Benzoic acid undergoes Friedel-Crafts alkylation to form o- and p-Toluic acid.

What are the major products of the oxidation of pentan-2-one with concentrated HNO3 at very high temperatures?