QQuestionChemistry
QuestionChemistry
If (S)-glyceraldehyde has a specific rotation of - 8.7 o , what is the specific rotation of (R)-glyceraldehyde?
A) - 8.7 o
b) + 8.7 o
c) 0.0 o
d) it cannot be determined with the information given
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand Specific Rotation
Specific rotation is an optical property that describes how a chiral molecule rotates plane-polarized light. For enantiomers (mirror image molecules), specific rotations have equal magnitude but opposite signs.
Step 3:: Analyze the Given Information
- We know the specific rotation of (S)-glyceraldehyde is $$-8.7°
Step 4:: Determine the Specific Rotation of (R)-Glyceraldehyde
Therefore, the specific rotation of (R)-glyceraldehyde will be $$+8.7°
For enantiomers, the specific rotation will have: - The same absolute value - Opposite sign
Step 5:: Verify the Options
c) $$0.0°$$ - Incorrect
Looking at the given choices: d) Cannot be determined - Incorrect
Final Answer
Key Insight: Enantiomers always have specific rotations of equal magnitude but opposite signs.
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