This compound reacts with an acidic solution of 2,4-dinitrophenylhydrazine to give a crystalline...

The proton NMR spectrum of a compound of formula C₁₀H₁₂O follows. This compound reacts with an acidic solution of 2,4-dinitrophenylhydrazine to give a crystalline derivative, but it gives a negative Tollens test. Propose a structure for this compound and give peak assignments to account for the signals in the spectrum.