Statement 1: Friedel-Crafts reaction is used to introduce an alkyl or acyl group in benzene nucleusStatement 2: Benzene is a solvent for the Friedel-Crafts alkylation of bromobenzene.

Yes, we use Friedel-Crafts  for introducing an alkyl or acyl group in benzene nucleus. Thus, statement I is true.However, the statement 2 is not true because if benzene is used as a solvent, during alkylation of bromobenzene, benzene will be alkylated in preference to bromobenzene because benzene is more reactive towards Electrophilic substitution  than bromobenzene.