QQuestionChemistry
QuestionChemistry
If (S)-glyceraldehyde has a specific rotation of - 8.7°, what is the specific rotation of (R)-glyceraldehyde?
A) 0.0°
B) - 8.7°
C) + 8.7°
D) cannot be determined from the information given
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Answer
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Step 1: Understand the problem
The specific rotation of a chiral molecule is a physical property that describes the rotation of plane-polarized light as it passes through a solution of the molecule. The specific rotation of (S)-glyceraldehyde is given as - 8.7°. The enantiomer of (S)-glyceraldehyde is (R)-glyceraldehyde, and enantiomers have equal but opposite specific rotations.
Step 2: Determine the specific rotation of (R)-glyceraldehyde
+8.7^\circ
Since (R)-glyceraldehyde is the enantiomer of (S)-glyceraldehyde, their specific rotations have the same magnitude but opposite signs. Therefore, the specific rotation of (R)-glyceraldehyde is:
Final Answer
The specific rotation of (R)-glyceraldehyde is + 8.7° (option C).
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