[HaroTaro]

In the lab, we learned to prepare a Grignard reagent using bromobenzene. But I'm wondering, what would happen if i use t-butyl bromide as a starting material instead of bromobenzene? An impurity would probably form right? Is t-butyl magnesium bromide the "impurity"? Would t-butyl bromide be able to give the same amount of yield of Grignard reagent?