Estimate the stabilization energy for 1,3-cyclohhexadiene using the heats of hydrogenation in Table 1. Table 1.
Heats of Hydrogenation for Selected Compounds
Compound
Moles H₂
$\Delta$ H(kJ mol^-1)
Cyclohexene
1
-120
1,4-Cyclohexadiene
2
-240
1,3-Cyclohexadiene
2
-232
1,5-Hexadiene
2
-253

Question

Estimate the stabilization energy for 1,3-cyclohhexadiene using the heats of hydrogenation in Table 1. Table 1.
Heats of Hydrogenation for Selected Compounds
Compound
Moles H₂

\Delta

H(kJ mol^-1)
Cyclohexene
1
-120
1,4-Cyclohexadiene
2
-240
1,3-Cyclohexadiene
2
-232
1,5-Hexadiene
2
-253

Quizplus · Accepted Answer

The stabilization energy for 1,3-cyclohexadiene can be calculated as the difference between the heats of hydrogenation of 1,3-cyclohexadiene and 1,4-cyclohexadiene, which have the same number of double bonds but different positions. Therefore, the stabilization energy is (240 kJ/mol - 232 kJ/mol) = 8 kJ/mol, which corresponds to choice C.

Estimate the Stabilization Energy for 1,3-Cyclohhexadiene Using the Heats of Hydrogenation