Which of the following alkenes on ozonolysis give a mixture of ketones only?

The molecules having dipole moment are :-

An alkene "A" contains three C–C, eight C–H σ-bonds and one C–C π-bond. "A" on ozonolysis gives two

Which one of the following has the smallest heat of hydrogenation per mole

In the above reaction A, B and C are given by the set

Oxidation of isobutylene with acid potassium permanganate gives