Chapter 12, Problem 51P

Both $\text{1,2-dihydronaphthalene}$

and $\text{1,4-dihydronaphthalene}$

may be selectively hydrogenated to $\text{1,2,3,4-tetrahydronaphthalene}$.

One of these isomers has a heat of hydrogenation of $\text{101 kJ/mol }\left(\text{24}\text{.1 kcal/mol}\right)$, and

the heat of hydrogenation of the other is $\text{113 kJ/mol}$

$\left(\text{27}\text{.1 kcal/mol}\right)$. Match the heat of

hydrogenation with the appropriate dihydronaphthalene.