Question

Here are some uncommon functional groups, predict and justify whether each is an o/p or a meta-director for electrophilic substitution when attached to a simple phenyl ring by the open bond:

-O-CF₃   -N=O    -O-SO₂-OMe

Answer 1

-O-CF₃ , it is o/p directing group , because O-atom linked to phenyl group,which posses two lone pairs and involves in resonance.so that,the incoming group may be directed to o/p position.

-N=O , it is meta directing group.because -NO group involves in resonance and directs the incoming group to meta position.

-O-SO₂-OMe   , it is o/p directing group , because O-atom linked to phenyl group,which posses two lone pairs and involves in resonance.so that,the incoming group may be directed to o/p position.