Not too easy. Not too difficult.
I'd recommend Organic Chemistry for the variety of careers it can lead to. Whether your focus is in food science or growing plants, nearly anything that grows falls under this major, and if you're worried it is too broad a major, take a look at the broad variety of minors that are available to it.
The basics of Organic Chemistry. The common making-ups of organic life forms and some of the make-ups of common plant based chemicals.
Hours per week:
Advice for students:
Have a strong interest in science if you're thinking about taking this class. The information isn't very applicable if you aren't planning a major related to it.