Haloalkanes and Haloarenes - Result Question 3
####3. In an $S_N 1$ reaction on chiral centres there is :
[2015 RS]
(a) $100 %$ racemization
(b) inversion more than retention leading to partial racemization
(c) $100 %$ retention
(d) $100 %$ inversion
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Solution:
- (b) In $S_N 1$ reaction, carbocation a planar species as intermediate is formed.
So attack from below or above the plane can take place. If $50 %$ attack below and above the plane of carbocation take place than $100 %$ racemization occurs but it may not be highly probable.
i.e. if inversion occurs more than retention leading to partial racemization.
