00:02
Dear students, four groups are given here a, b, c and d, and out of this, which one is the strongest activating group in aromatic -electrophilic substitution reaction? now aromatic -electrophilic substitution reaction, for example, to understand this, let us take a benzene ring.
00:23
Now here, let we are having this group, ch, cs3, cs3.
00:32
Now this group, for let us take the first one isopropyl group, this group is a plus i group.
00:38
It releases electron and it has inductive effect only.
00:42
So it releases electrons to the benzene ring with plus i and plus h hyperconjugation.
00:49
Then coming to the second one here, ch2, similarly here we are having the ring, then ch2, then o cs3 now here two single bonds are there so there is no resonance only there is plus i sorry minus i effect because ocs3 is the minus i group electron withdrawing group inductive group so it is minus i then coming in the third one we have c double bond o nh cs3 here the kernel group is directly attached to a benzene ring and kernel group is electron withdrawing.
01:34
So it is minus r group...