用表中的基团增量数值证明或驳倒下面的观点：
a．支链烷烃比直链烷烃更稳定。
b．对于直链烯烃而言，位于中间的双键比末端双键更稳定。
c．烯烃的氢化通常比类似的羰基化合物的氢化放热更多。
常见官能团的基团贡献值(单位：kcal/mol)

基团 Delta H_{f}^{ominus } 基团 Delta H_{f}^{ominus } 基团 Delta H_{f}^{ominus } C—(H)3(C) -10.20 Cd—(CB)(C) 8. C—(Cd)(C)2(H) -1.48
C—(H)2(C)2 -4.93 Cd—(Cd)2 4.6 C—(CB)(C)2(H) -0.98
C—(H)(C)3 -1.90 CB—(H) 3.30 C—(Cd)(C)3 1.68
C—(C)4 0.50 CB—(C) 5.51 C—(CB)(C)3 2.81
Cd—(H)2 6.26 CB—(Cd) 5.68 C—(O)(C)3 -6.6
Cd—(H)(C) 8.59 CB—(CB) 4.96 C—(O)(C)2(H) -7.2
Cd—(C)2 10.34 C—(Cd)(C)(H)2 -4.76 C—(O)(C)(H)2 -8.1
Cd—(Cd)(H) 6.78 C—(Cd)2(H)2 -4.29 C—(O)(H)3 -10.08
Cd—(Cd)(C) 8.88 C—(Cd)(CB)(H)2 -4.29 C—(O)(CB)(H)2 -8.1 Cd—(CB)(H) 6.78 C—(CB)(C)(H)2 -4.86 C—(O)(Cd)(H)2 -6.5 CB—(0) -0.9 CO—(O)(C) 35.1 N—(C)3 24.4
O—(C)2 -23.2 CO—(O)(H) -32.1 N—(CB)(H)2 4.8
O—(C)(H) -37.9 CO—(O)(Cd) -32.0 N—(CB)(C)(H) 14.9
O—(Cd)2 -33.0 CO—(O)(CB) -36.6 N—(CB)(C)2 26.2
O—(Cd)(C) 30.5 CO—(Cd)(H) 29.1 N—(CB)2(H) 16.3 O—(CB)2 -21.1 O—(CO)(C) -43.1 N1—(H) 16.3
O—(CB)(C) -23.0 O—(CO)(H) -58.1 N1—(C) 21.3
O—(CB)(H) -37.9 Cd(CO)(C) 7.5 N1—(CB) 16.7 C—(CO)(C)3 1.58 Cd—(CO)(H) 5.0 CO—(N)(H) 29.6
C—(CO)(C)2(H)) 1.83 C—(O)2(C)2 -18.6 CO—(N)(C) -32.8
C—(CO)(C)(H)2 -5.0 C—(O)2(C)(H) -16.3 N—(CO)(H)2 14.9
C—(CO)(H)3
-10.08 C—(O)2(H)2 -16.1 N—(CO)(C)(H) 4.4
CB—(CO) 9.7 C—(N)(H)3 -10.08 N—(CO)(C)2 — CO—(C)2 -31.4 C—(N)(C)(H)2 -6.6 N—(CO)(CB)(H) 0.4 CO—(C)(H) -29.1 C—(N)(C)2(H) -5.2 N—(CO)2(H) -18.5 CO—(H)2 -26.0 C—(N)(C)3 3.2 N—(CO)2(C) -5.9
CO—(CB)2 25.8 CB—(N) -0.5 N—(CO)2(CB) -0.5 CO—(CB)(C) -30.9 N—(C)(H)2 4.8
CO—(CB)(H) -29.1 N—(C)2(H) 15.4