Write the structures of as many simple alkenes as you can that, upon catalytic hydrogenation with H2

Question:

Write the structures of as many simple alkenes as you can that, upon catalytic hydrogenation with H2 over Pt. will give as the product
(a) 2-methylbutane:
(b) 2.3-dimethylbutane;
(c) 3.3-dimethylpentane;
(d) 1, 1, 4-trimethylcyclohexane.
In each case in which you have identified more than one alkene as an answer, rank the alkenes in order of stability.