How to decide this reaction is SN1 or SN2

#1

#2

See it's video sol

#3

Weak nucleophile can be a reason

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#4

branching at beta carbon

#5

it is polar protic so sn1

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#6

We can decide SN1 and SN2 reaction on the basis of reagent (a strong reagent will follow SN2 )
And on the basis of solvent.