Question

19 multiple choice 2 points explain the relation between absolute configuration (r and s) and optical rotation (+) and (-). the only relation of r and s with (+) and (-) is that if the r isomer is dextrorotatory (+) then the s isomer must be levorotatory (-). the r isomers are always dextrorotatory (+) and the s isomers are always levorotatory (-). the r isomers are always levorotatory (-) and the s isomers are always dextrorotatory (+). there isnt any relation of r and s with (+) and (-). if the r isomer of any compound is dextrorotatory (+) then the s isomer could be either dextrorotatory or levorotatory. previous

Explanation:

The R - S system describes absolute configuration, while (+) and (-) describe optical rotation. Optical rotation is a physical property and is not determined by the R - S configuration assignment. One cannot predict the sign of optical rotation based on the R - S designation of a chiral compound.

Answer:

The fourth option: There isn't any relation of R and S with (+) and (-). If the R isomer of any compound is dextrorotatory (+) then the S isomer could be either dextrorotatory or levorotatory.