Question

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 ______.

पर्याय

• carbanion

• carbene

• carbocation

• free radical

Answer 1

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 carbocation.

Explanation:

Carbocations can be attacked on any side to create a racemic mixture since they are planar.

\[\begin{array}{cc}
\phantom{.}\ce{Cl - CH - CH3 ->[SbCl5][Toluene] \underset{(carbocation)}{Ph - \overset{⊕}{C}H - CH3} + SbCl^{-}_6 -> Ph - CH - CH3 + SbCl5}\\
\phantom{}|\phantom{......................................................}|\phantom{............}\\
\phantom{.}\ce{\underset{(-)}{Ph}}\phantom{................................................}\ce{\underset{(d + ℓ) mixture}{Cl}}\phantom{........}
\end{array}\]