Which Compound Has R Configuration?

AI Thread Summary
The discussion revolves around identifying which compound has R configuration in a chemistry problem from the International Chemistry Olympiad. Participants initially struggled with the configurations, with some concluding that both compounds were S. A suggestion was made to redraw the structures correctly, as the arrangement of groups affects the configuration determination. After reevaluation, one participant concluded that the first compound is R, while another noted that the answer key indicated the second compound as R. The conversation highlights the importance of accurate structural representation in determining stereochemistry.
AGNuke
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I got this problem today in my International Chemistry Olympiad Paper, quite bugging me this question, so I am better off asking it.

My question is, which of the following has R configuration?

ICho.png



From what I tried, I got both of them as S, and the remaining two options being confirmed S. I got it wrong, but it wouldn't hurt (or it would) to know the right answer.
 
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Were they drawn like this? Usually the two groups in the plane of the paper are adjacent rather than opposite as BOTH of these structures are! Redraw them correctly and the answer will present itself.
 
Yes, they were drawn like this. That's why it posed a problem to me.
 
So, redraw them and the answer will be obvious.
 
Alright, after a lot of struggle, I reached the conclusion that 1st one is R.
 
Me too.
 
UPDATE : In the answer key released by my institute, the answer mentioned is the second one... :confused:
 

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