Both 1, 2-dihydronaphthalene and 1, 4-dihydronaphthalene may be selectively hydrogenated t...

Both 1, 2-dihydronaphthalene and 1, 4-dihydronaphthalene may be selectively hydrogenated to 1, 2, 3, 4-tetrahydronaphthalene.

One of these isomers has a heat of hydrogenation of 101 kJ/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kJ/mol (27.1 kcal/mol). Match the heat of hydrogenation with the appropriate dihydronaphthalene.