A)
B)
C)
D)
Correct Answer: A
Solution :
\[{{S}_{N}}1\]unimolecular nucleophilic substitution reaction is favoured with the stability of carbocation. [a]
\[3{}^\circ \]carbocation [b] 
\[1{}^\circ \] carbocation [c] 
Arylic carbocation [d]
(Unstable\[1{}^\circ \]carbocation) Thus, reaction [a] is feasible.
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