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Q.
$S_N1$ reaction is fastest in
UP CPMTUP CPMT 2013
Solution:
Order of reactivity of alkyl halides towards $S_N1$ reaction is $3^{\circ} > 2^{\circ} > 1^{\circ} > CH_3 — X$.
Above order of reactivity can be explained on the basis of the stability of intermediate carbocation.