When of the following compounds react slower than benzene in electrophilic bromination ?

Which of the following compounds reacts slower than benzene in electrophilic bromination in the benzene ring?

Which of the following compounds react slower than benzene in electrophilic substitution?

How many of the following compounds are more reactive than benzene towards electrophilic substitution.

How many of the following compounds are more reactive than benzene towards electrophilic substitution?

How many of the following compounds are more reactive than benzene towards electrophilic substitution.

Which of the following will undergo nitration slower than benzene ?