Question

16 multiple choice 2 points if (s)-glyceraldehyde has a specific rotation of -8.7°, what is the specific rotation of (r)-glyceraldehyde? -8.7° +8.7° 0.0° cannot be determined from the information given

Explanation:

Step1: Identify enantiomers

(S)-glyceraldehyde and (R)-glyceraldehyde are enantiomers.

Step2: Recall property of enantiomers

Enantiomers have equal - but opposite - specific rotations.

Step3: Determine the rotation

Since (S)-glyceraldehyde has a rotation of - 8.7°, (R)-glyceraldehyde has a rotation of +8.7°.

Answer:

B. +8.7°