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  4. (+)-2 -butanol has [θ ]λ 25=+13.9° . A sample of 2 -butanol containing both the enantiomers was found to have a specific rotation value of -3.5° under similar condition. The percentage of the (+) and (-) enantiomer present in the sample are, respectively:

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Q. $\left(+\right)-2$ -butanol has $\left[\theta \right]_{\lambda }^{25}=+13.9^\circ $ . A sample of $2$ -butanol containing both the enantiomers was found to have a specific rotation value of $-3.5^\circ $ under similar condition. The percentage of the $\left(+\right)$ and $\left(-\right)$ enantiomer present in the sample are, respectively:

NTA AbhyasNTA Abhyas 2022

Solution:

Enantiomeric excess $=\left(\frac{d - l}{ d + l} \times 100\right)$