Chemistry - GOC Question with Solution | TestHub

T is a primary $\mathrm{C}-\mathrm{H}$ bond (the $\mathrm{C}{\mathrm{H}}_3$ group, about 101 kcal/mol). Bond energy order: vinylic $>$ primary $>$ secondary $>$ tertiary $>$ allylic.

In the ring (4-methylcyclohexene) the lower $\mathrm{C}-\mathrm{H}$ bonds are: the two allylic positions ${\mathrm{C}}_3-\mathrm{H}$ and ${\mathrm{C}}_6-\mathrm{H}$, the tertiary ${\mathrm{C}}_4-\mathrm{H}$ (carrying the $\mathrm{C}{\mathrm{H}}_3$) and the secondary ${\mathrm{C}}_5-\mathrm{H}$. The vinylic ${\mathrm{C}}_1-\mathrm{H}$ and ${\mathrm{C}}_2-\mathrm{H}$ bonds are stronger than T.

Total = 4.

Answer: 4.