1.

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is

Answer»

`-NH_(2)`
`-Cl`
`-NO_(2)`
`-C_(2)H_(5)`

Solution :`-Cl` group is o-, p-directing DUE to `+R` effect , however it is deactivating due to STRONG -I effect of CL (different from other o-, p-directinggroups which are ACTIVATING). The net result is that chlorobenzene undergoes o-, p-substituttion with difficulty.


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