Destroyer #307 OCHEM

[molarbear8895]

Hello, can someone please help me with Q # 307?
It is about R/S configuration and I am struggling to see how this is possibly a 2R,3S,4S configuration.

The answer key says
C-2 priority is given to 1st-Cl, 2nd-C attached to a Cl, 3rd-C attached to OOO
I am very confused because I though priority was determined by electronegativity?

The other 2 chiral carbons are also weird to me and do not give priority based on electronegativity but I think this example gets the point across.

THANKS and please explain...

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[Crithu]

Priority is determined by atomic number.

 

[molarbear8895]

WOW thank you!