Question

Indicate by an arrow the positon(s) where `SE` reaction takes place in the following:

j. `Ph - CF_(3)`
k. `Ph - overset(o+)(N) R_(3) } NO_(3)^(o-)`
l. `o,m-` and `p-` Ethoxyacentanilide

Answer 1

a.
`Se` reaction takes place at the place indicated by the arrows in the centra ring. Since it is joined to two activating phenyl rings.
b.
c.
Same explanation as in (b), `p-` product is major.
d.
Ring `(A)` bonded to `(underset(..)overset(..)(-O-))` group is activated.
RIng `(B)` bonded to `(underset(O)underset(||)(-C-))` group si deactivated `p-` product is major.
e.
Ring `(B)` is deactivated by `(-CN)` group. Ring `(A)` is activated by `(-CH_(2) - Ar)` group. `p-` product is less hindered from than `orhtho`, so it is major product.
f. [same explanation as in `(e)`]
g.
The `(-COOH)` group is deactivating and `m-` directing, `(-CH_(3))` group is activating, and `o-` and `p-` directing class `I(-CH_(3))` decides orientation.
h.
The `(-COOH)` group is deactivating and `m-` directing, `(-OH)` is activating, and `o-` and `p-` directing class `I (-OH)` decides orientation.
i.
No reaction because of two strongly deactivity `(-NO_(2))` groups.
However, the `(-NO_(2))` group si `m-` director, if suitable conditions are employed then `(-NO_(2))` directs at `m-` positon.
j.
Deacttivting by strong `-I` effect of three `F` atoms and `m-` directing.
k.
Deactivated by strong `-I` effect fo `overset(o+)(N)R_(3)` and `m-` director.
l.

When both the groups are nearly equal moderate activators and both are `o-` and `p-` directing, then the products of the reaction ortho and para to both are obtained.