The earliest literature reference for the optical rotation of a pure enantiomer

Question

The earliest literature reference for the optical rotation of a pure enantiomer of a chiral stereoisomer of structures m-t lists a specific rotation of 7.35 degree. If a more recent reference gives a specific rotation of 10.3 degree for the same enantiomer, assuming this latter rotation is correct, what was the composition of the major enantiomer of the 7.35 degree mixture? Interestingly, an elevated ratio of the major to minor enantiomer is an indication of a yeast infection in humans. a. (1 + 7.35/10.3) times 100% b. (1 - 7.35/10.3) times 100% c. (1 + 7.35/10.3) times 50% d. (1 - 7.35/10.3) times 50% e. not a.-d Structure Ohm for sure is? Structure Ohm is a common sugar substitute and is poisonous to dogs. a. d b. D c. l d. L e. not a. -d.

Explanation / Answer

If the mixture was pure enantiomer the composition would be 100% and rotation 10.3. But it is less than that by a amount (7.35/10.3) *100.

Correct answer : (b)

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