Problem: Which statement is true? a) Compounds with R stereocenters rotate plane-polarized light clockwise.  b) For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized light equally, but in opposite directions.  c) Racemic mixtures can rotate plane-polarized light either clockwise or counterclockwise. d) Meso compounds can rotate plane-polarized light either clockwise or counterclockwise. 

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Problem Details

Which statement is true?

a) Compounds with R stereocenters rotate plane-polarized light clockwise. 

b) For equal concentrations and equal path lengths, solutions of (+) and (-) enantiomers rotate plane-polarized light equally, but in opposite directions. 

c) Racemic mixtures can rotate plane-polarized light either clockwise or counterclockwise.

d) Meso compounds can rotate plane-polarized light either clockwise or counterclockwise. 

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Based on our data, we think this problem is relevant for Professor Fleming's class at TEMPLE.