a) Below is the ${ }^{1} \mathrm{H}$ NMR spectrum of this week's product. Label the hydrogens in 4vinylbenzoic acid as $\mathrm{Ha}, \mathrm{Hb}$, etc. Then label the NMR signals with corresponding $\mathrm{Ha}$, $\mathrm{Hb}$ etc. The signal at around $7.26 \mathrm{ppm}(2905.20 \mathrm{~Hz})$ is the $\mathrm{NMR}$ solvent $\mathrm{CDCl}_{3}$. Ignore the hydrogen in carboxylic acid. b) Briefly explain your reasoning behind the assignments of the hydrogens in the alkene region.

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