Chapter 22, Problem 22.76P

Identify the structures of A and B, isomers of molecular formula ${\text{C}}_{\text{10}}{\text{H}}_{\text{12}}{\text{O}}_{\text{2}}$, from their IR data and ${}^{\text{1}}\text{H}$ NMR spectra.

a. IR absorption for A at $1718{\text{cm}}^{-1}$

b. IR absorption for B at $1740{\text{cm}}^{-1}$