Why is ethylene used as monomer?
Because (i) it is cheap; you get it from a hole in a ground; and (ii) processes exist to transform the monomer into a higher value polymer.
As you know, it is relatively hard to make a
One of ethylene surprising uses is as a plant hormone. By means of ethylene gas you can stimulate the ripening of unripe fruit (a good strategy when you have a warehouse full of green tomatoes or green bananas). In these circumstances, small quantities of ethylene are generated by electrolytic reduction of ethyl alchohol.