Thanks, Borek! I'm still kind of lost, though, so I think I haven't grasped the reasoning behind it yet
I tried to see my book's resolution, and I noticed it ignored the methyl groups (as you mentioned), but I still cannot understand why.
I would have guessed that, in the -CH2
- group, it doesn't really matter where the Cl goes, since the sigma bond allows rotation. I remember a teacher telling me that the sigma + pi bond doesn't allow rotation, but the sigma-only bond does. So it doesn't matter where it attacks, we can just rotate it 180°.
... or maybe this doesn't have anything to do with this exercise and I'm just totally lost.
But as for all the rest, I really don't know. I would still have answered "5", maybe, because now I count the two H in -CH2
- as one.