Doubt from substitution

Will option c will undergo SN1 as the carbocation is not in conjugation with double bond.

May be there will be a hydride shift to get +ve charge on allylic position

But that carbocation will not be stable as previous one, right?
alpha hydrogen will reduce so that should not be the next step

But there will be conjugation of pi electron which makes carbocation more stable

It’s right that allylic position will be stable but for deciding wether it will undergo Sn1 or not we are not supposed to see the stability of rearranged carbocation , we are supposed to see only the stability of the 1st carbocation formed !

@Gaurav_2020_3 new carbocation after rearranging it to the allylic position will be more stable than previous one because we are supposed to see overall stability of C+ that comprises of resonance , +M and +H , you are only considering +H effect , but here as rearranged C+ will be resonance stabilised it can very easily compensate the loss apha H

All will under go SN1 because all are forming 2degree carboncation.SN2 will under go on1 degree carboncation. Option B and C both are almost same in fact in there is resonance after rearrangement.

Hello @Gaurav_2020_3,

Because of allylic H shift it is possibe that option c can undergo SN1 reaction. Because the carbocation forming after allylic H shift is resonance stabilized.