2012 ochem destroyer #231

[getsome111]

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http://imgur.com/Pu55PxO

I was quite sure it was A as in 2R, 3S-2-bromo-3-chlorobutanoic acid, but the answer in the back says it is C, also, in the answer they redrew(rotated) the molecule to have its length along the horizontal axis during their explanation, I thought that you could only rotate fischer projections 180 degrees and not 90; this is why I think this may be a mistake. Thanks for any insight

 

[SafetyDog]

Trick question!

I missed the same one too, but the question is asking for the enantiomer so you have to switch the two.

 

[getsome111]

ah, I feel like not reading questions properly is going to be my downfall on the dat :/, thanks