Question

The (+) enantiomer of compound D has an optical rotation of 25°. If a pure sample of D contains 80% of the (+) enantiomer and 20%
of the (-) enantiomer, what is the optical rotation value?
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Answer 1

Answer:

15°

Explanation:-

• PURE=25°

• % Major = 80%
• % Minor = 20%

Optical Purity = X/25 = 80-20 = 60%

Solve for X

• X = 15°