[thumper101]

Here;s the work I did. I changed all the structures that needed to into a staggered position, then made the longest chain on the vertical bonds. Then applied the wedge dash and used Cahn Ingold Prelog. My answers are posted but my professor's answers are RR, RS, SR, RR. Many of her answers on the key seem to be incorrect which is very stressful to try and find out whether I messed up or she did. Anyway, can anyone help confirm if my answers are correct? Thank you

[Sophia7X]

I checked the ones that differ from your professor and I got the same answers as you.

[Dan]

my professor's answers are RR, RS, SR, RR.

Definitely incorrect.

I agree with you on N, M and P but I think you should have another look at O.