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Dextrororatory bytan`-2-ol` has a specific rotation `[alpha]_(D)^(25) =+13.52^(@)`. A sample of butan`-2-ol` shows a specific rotation `[alpha]_(D)^(25)=+6.72^(@)`. Calculate the enantiomers excess (or optical purity) of the sample?A. `60%`B. `50%`C. `70%`D. `80%` |
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Answer» Correct Answer - B `%` Enantiomeric excess (optical purity) `=("observed specific rotaiton")/("specific rotation of the pure enantiomer") xx 100%` `= (+6.76^(@))/(+13.52^(@)) xx 100%` `= 50%` |
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