A partially racemised (+) - 2-bromo-octa...

A partially racemised `(+) -` 2-bromo-octane `(2^@ RX)` on reaction with aq. `NaOH` in acetone gives an alcohol with `80 %` inversion and `20 %` racemisation. What is the percentage of back-side attack ?

0.4

0.1

0.9

0.8

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