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.

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200 180 160 140 120 100 80 60 40 20 Offset: 40 ppm CjoH120 10 9. 8. 7. 5 4 3 2 8 (ppm)