Topic Question Set
Q 1
:
The set of meta directing functional groups from the following sets is: [2024]
(4)
–M groups decrease electron density at ortho and para position of benzene, thereby directing the incoming electrophile to meta position. Hence –M groups are meta directing groups for electrophilic aromatic substitution reactions.
Groups of the type –X = Y or –X ≡ Y act as –M groups. Among given species, and are –M groups, hence are meta directing groups.
Q 2
:
Among the following, total number of meta directing functional groups is ________ . (Integer based)
[2024]
(4)
Among given species, and are M groups, hence are meta directing groups.
Q 3
:
The arenium ion which is not involved in the bromination of Aniline is ____. [2024]
(3)
due to its effect is ortho and para directing group for electrophilic substitution reactions such as bromination. Hence, bromine would not attack the meta position (low electron density position).
Q 4
:
The correct arrangement for decreasing order of electrophilic substitution for above compounds is: [2024]
(III) > (I) > (II) > (IV)
(IV) > (I) > (II) > (III)
(III) > (IV) > (II) > (I)
(II) > (IV) > (III) > (I)
(1)
More is electron density on the ring, more is the rate of electrophilic substitution reaction.
Q 5
:
Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is ______. [2024]
(2)
-M groups decrease electron density on aromatic ring hence act as deactivating groups in electrophilic aromatic substitution reactions. Groups of the type and act as groups. Among given options and are groups, thus acts as deactivating groups.
and are +M groups hence act as activating groups for electrophilic aromatic substitution reactions. +M groups have a lone pair of electrons on first atom.
Q 6
:
Identify correct statement/s [2025]
(A) – and – are activating group.
(B) –CN and –OH are meta directing group.
(C) –CN and – are meta directing group.
(D) Activating groups act as ortho- and para directing groups.
(E) Halides are activating groups.
Choose the correct answer from the options given below:
(A), (B) and (E) only
(A), (C) and (D) only
(A) only
(A) and (C) only
(2)
(A) For – and –, +M effect is more than – effect, hence these are activating groups.
(B)(C) –CN and – are –M groups. –M groups decrease electron density at ortho and para position hence are meta directing for electrophilic substitution reactions. –OH is a +M group. +M groups increase electron density at ortho and para positions, hence are ortho and para directing for electrophilic substitution reactions.
(D) Activating groups are +M groups. +M are ortho and para directing for electrophilic substitution reactions.
(E) For halides – > +M, hence these are deactivating groups.
Q 7
:
Given below are two statements: [2025]
Statement I: On nitration of m-xylene with , followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product.
Statement II: – group is o/p-directing while – group is m-directing group.
In the light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are false
Statement I is false but Statement II is true
Both Statement I and Statement II are true
Statement I is true but Statement II is false
(3)
Statement I:
Statement II: Because of hyperconjugation effect of alkyl groups, electron density is increased at ortho and para position of benzene. Hence incoming electrophiles are directed to ortho and para position. Because of –M effect of nitro group, electron density is decreased at ortho and para position of benzene. Hence incoming electrophiles are directed to meta position.
Q 8
:
In the following series of reactions identify the major products A & B respectively. [2025]
(2)
