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Q.
In $S_{N^1}$ reaction, . the recimisation takes place due to
The p-Block Elements
Solution:
$S_{N^1}$ reaction involves formation of carbocation which are planar ($sp^2$-hybridised) and thus can be attacked on either side of carbon.
Primary amines react with $CHCI_3$ in alcoholic KOH to form isocyanides $(Carbylamine\, reaction)$.