For the compound 4-methylpent-3-en-2-one ((CH3)2C=CH-CO-CH3), what are the number of signals expected in its 1H and 13C NMR spectra, respectively?

Arrange the following functional groups/compounds in increasing order of their infrared (IR) absorption wavenumber (νmax) for the carbonyl (C=O) stretch: (i) 2-Cyclohexenone (Conjugated ketone) (ii) Cyclobutanone (iii) Cyclopentanone (iv) Cyclohexanone

The carbonyl stretching frequency of an acetamide molecule in IR spectra would be approximately __________.