Which of the following froups groups deactivates the benzene ring towards electrophilic substitution ?

Which of the following substituents deactivates the benzene ring towards electrophilic substitution?

Which of the following group(s) activate the benzene ring towards electrophilic substitution reaction.

Which of the following groups is o-p directing but deactivates benzene ring for electrophilic substitution?

Which of the following is less reactive than benzene towards electrophilic substitution reaction ?

The presence of which one of the following groups on benzene nucleus activates it towards electrophilic substitution?