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a. The specific rotation of a pure enant...

a. The specific rotation of a pure enantiomer is `+10^(@)`. What will be its observed rotation if its is isolated from a reaction with
i. `30%` racemisation and `70%` retention.
ii. `70%` racemisation and `30%` inversion.
b. What is the percentage composition of a mixtrue of two enantiomers whose rotation is `-10^(@)`? The specific rotation of pure enantiomers is `-20^(@)`.
c. What is the optical purity of a sample having an `[alpha]_(obs.)=+9.0^(@)` if `[alpha]_(D)=+12^(@)`.

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