I'm working on a project and I need to know if the following chemicals are organic and/or carbon based: methanol, acetone, esters and tannins. I've done some research and I believe the first three are, but I can't figure out the situation with tannins. I'm leaning towards no, but can anybody explain?

Thank you in advance!

Google out the molecular formula for tannins.
Go through the basic definition of organic molecules
You will definitely get your answer