This is from my lecture notes. Is this video based on the same thing? Unless there's a video on cyclopropanation. I wasn't able to find your guy's video on it

At 21:57, how come we don't attack the secondary because the rule with working for acids, isnt it that you attacked the most substituted? My professor said this

Acid = (most substituted)

1st step. Proton Transfer

2nd step. Sn2

Base = (least substituted)

1st step. Sn2

2nd step. Proton Transfer

This was at 4:01. Would my answer work too?

At 18:30, I put this as my result. Would this be incorrect? I didn't see you add the hydrogens