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

The presence of which one of the following groups on benzene nucleus a

1.	The presence of which one of the following groups on benzene nucleus activates it towardselectrophilic substitution?
Answer» `-CN` `-CHO` `-COOR` `-O-COR` SOLUTION :`-O-COR` group on benzene NUCLEUS activates it towards electrophilic substitution