This is my first review, please forgive me for anything I am saying that is retarded .
I think the article is small enough where it doesnt need a contents box, takes up a bit too much space.
also, some captions aren't capitalized, my ocd is killing me with the uncapitalized title as well.
this is a great topic to talk about, and i haven't thought of anything yet, but you should make at least alkanes and alkenes a bit longer. maybe like a paragraph or so.