So molecule a, did I have any chiral centers? Meaning did I have any atoms that had 4 different groups on them. Okay? And the answer is no. Okay? The closest thing to that was this carbon right here. What that carbon has is it has a 3 carbon chain on one side. It has an OH on the other side, but then at the bottom, it has 2 H's. Okay. So does it have 4 different groups? No. 2 of the groups that it has on it are exactly the same. So are there any chiral centers? No. Okay.

Let's talk about trigonal centers. Are there any double bonds that can form cis or trans on here? There's not any double bonds at all, so no. So according to test number 2, would this be chiral or would this be achiral? The answer is that this would be achiral. Why? Because of the fact that it doesn't have any chiral centers and remember that chiral centers are a source of chirality. So we can assume that if it doesn't have any chiral centers, that it's going to be achiral. Isn't that easy? So just say okay, does it have chiral centers? No. Then it's going to be achiral. It's as easy as that. Okay? So now I want you guys to work on molecule b.