question 9 please and thank you

Both 1,2-dihydroonaphthalene and 1,4-dihydronaphthalene may be selectively hydrogenated to 1,2,3,4-tetrahydronaphthalene. PtH2 PtH2 1,2-dihydronaphthalene 1.23,4 tetratydro. 14. diliydronaphthalene One of these isomers has a heat of hydrogenation of 101kJ/mol and the heat of heat of hydrogenation of the other is 113kj/mol. Match the heat of hydrogenation with the appropriate dihydronaphthalene and explain your reasoning