6. If t-butyl bromide was used as a substrate instead of t-butyl chloride the reaction rate would stay the same. The mechanism will still be SN1 reaction for the same reasons as t-butyl chloride. Such as, t-butyl bromide is tertiary alkyl halide like t-butyl chloride which will also favors SN1 reaction when reacted with water, a weak nucleophile. It will also form 30 carbocation which are more stable in SN1 reaction mechanisms as having more R groups (CH3 in this experiment) on the carbon with the positive charge will donate some electrons through hyperconjugation, as carbocation are electron-deficient p-orbital which could be stabilized by hyperconjugation from adjacent substituents. As for SN2 reaction tertiary halide would create too much
