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  4. A solution of (.-.)1-chloro-1-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :

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Q. A solution of $\left(\right.-\left.\right)1-chloro-1-phenylethane$ in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :

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Solution:

(-) - 1 - chloro-1-phenylethane is:
Solution .
Solution
With SbCl5 carbocation is formed. As the carbocation is planar, $\text{Cl}^{\ominus}$ can again attack from both sides giving racemic mixture. (d, l mixture formed)