In an S_N1 reaction on chiral centres, there is:

28 2015 AIPMT-II Haloalkanes and HaloarenesStereochemistry of SN1 Medium
In an $S_N1$ reaction on chiral centres, there is:
A 100% retention
B 100% inversion
C 100% racemization
D inversion more than retention leading to partial racemization

Detailed Solution

$S_N1$ gives a racemic mixture with slight predominance of the inverted product, because the leaving group partly shields the front side of the carbocation.

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