 This problem says, does this molecule rotate, plane, polarized light? So let's just do that analysis that we said. Remember, we can build the model of the molecule that we see up on the board, and then build what it's an anti-merge should be. In other words, we look here, have taken the liberty to build it previous to the recording. So you won't have to watch me build it. But anyways, you see the methyl groups up here, the methyl groups back here. We've got a methyl group here and a methyl group here. So remember, these are SB2, so there's no stereochemistry associated. So what we're going to do here is we're going to build the mirror image of this molecule. So I've taken, like I said, the liberty to do that already. So what do we do? We just see if those things are superimposable or not. Well, that way they're not. But if we turn it around, the methyl group is there. I don't know, black and white. But that methyl group is there. This methyl group is there. This methyl group is there. So if you're having a hard time finding these acaromolecules, just looking for internal planes of symmetry, if you have some time at the end of your test, build the molecules and then see if you can superimpose them. That'll tell you if they're chiral or not. So since we can superimpose its mirror image, is this molecule chiral or acyril? Acyril, yeah, any questions on this one?