Q. reaction is feasible in

 1487  165 Rajasthan PETRajasthan PET 2012 Report Error

Solution:

unimolecular nucleophilic substitution reaction is favoured with the stability of carbocation. [a]
carbocation [b]
carbocation [c]
Arylic carbocation [d]
(Unstable carbocation) Thus, reaction [a] is feasible.

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