Question #94 for Topscore test1

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Gauch08

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Hello, I can't figure out why answer choice A is R configuration and why answer choice C is S.

I think A should be S because the Br has first priority then COOH, then CH3. If this is true, A should be S instead of R.

For answer choice C, F has the highest priority then NH2, then COOH right?
 
remember to invert the configuration when the lowest priority group is pointing towards the front, which is the case in A and C.
 
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