Which hydrocarbon is it?

A formula alone tells a lot. You will count the hydrogens a hydrocarbon is short of the alkane, sort a list into alkanes, alkenes and alkynes, and pick out the alkenes.

The idea. The alkane with $c$ carbons has $2c + 2$ hydrogens. Two missing means an alkene, four missing an alkyne (if there is no ring).

Your tasks.

1. In missing, return how many hydrogens the formula is short of the alkane.
2. In kind, return "alkane", "alkene", "alkyne" or "other".
3. Fill alkenes with the names in formulas that are alkenes.