What is the reason behind the difference in stability of the given alkenes?

Arrange the following alkenes according to their heat of hydrogenation (From lowest to highest).

Which of the following alkenes are stable, and which ones are unstable? Support your answer with a suitable reason.

a. trans-3,4-dibromocyclopent-1-ene
b. 1,2-dibromocyclopent-1-ene
c. trans-cyclooctene
d. trans-1,2-dibromocyclopent-1-ene

Consider the following alkenes:

Arrange them in order of increasing stability. Justify your order.

Consider the following alkenes:

Determine which one is (i) the most stable, (ii) the least stable, and (iii) corresponds to the lowest heat of hydrogenation.

Determine which of the given alkenes is the most stable.

Provide an explanation of the relative stability (stable or unstable) of the given alkene.