VEDANT ZOPE last edited by
@Kuldeep-Jaidev it will be maximum in water
As water is one of the best polar protic solvent
The substrate tert-butyl bromide has electronegative bromine attached
to a 3° carbon. This causes significant polarity in the molecule. Other polar molecule water will be electrostatically attracted to the positive and negative surfaces of tert-butyl bromide molecules. This sets up the possibility of pulling the Br off (as Br-) and replacing it with an OH-. This reaction follows an SN1 path and SN1 prefers weak nucleophile like-H2O.