The proton NMR spectrum of a compound with formula C7H12O2 is shown. The infrared spectrum displays a strong band at 1738 cm−1 and a weak band at 1689 cm−1
. The normal carbon-13 and the DEPT experimental results are tabulated. Draw the structure of this compound.

The proton NMR spectrum of a compound with formula C₆H₅NCl₂ is shown. The normal carbon-13 and DEPT experimental results are tabulated. The infrared spectrum shows peaks at 3432 and 3313 cm^-1 and a series of medium-sized peaks between 1618 and 1466 cm^-1. Draw the structure of this compound.

Draw the structure of the compound that produced the spectra below. The infrared spectrum has strong bands at 1720 and 1738 cm^-1.