Rank the carbocations

You have four carbocations. Each one is described by the number of hydrogen atoms on every carbon next to the positive carbon. You will count the helpful C-H bonds, rank the ions and measure the gap between the best and the worst.

The idea. Each C-H bond on a neighbouring carbon can hyperconjugate. More such bonds means a more stable ion.

Your tasks.

1. Set isopropyl to the number of helpful C-H bonds of the isopropyl cation.
2. Set tert_butyl to the number for the tert-butyl cation.
3. Set order to a list of the four names, the most stable first.
4. Set gap to how many more helpful bonds the tert-butyl cation has than the ethyl cation.