Chapter 14, Problem 14.57P

Compound C has a molecular ion in its mass spectrum at $146$ and a prominent absorption in its IR spectrum at ${\text{1762 cm}}^{\text{–1}}$. C shows the following $\text{H}\text{ NMR}$ spectral data: $\text{1}\text{.47 }\left(\text{doublet, 3 H}\right)\text{, 2}\text{.07 }\left(\text{singlet, 6 H}\right)\text{, and 6}\text{.84 }\left(\text{quartet, 1 H}\right)\text{ ppm}$. What is the

structure of C?