A solution of (-) -1- chloro -1- phenylethane is toluene racemises slowly in the presence of a small amount of SbCl5 , due to formation of :
a) carbene
b) carbocation
c) free radical
d) carbanion
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Carbocation formation is the reason. The reaction must have proceeded via SN1 path coz the carbocation formed is 2° benzylic which is very stable.
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