Question

There are 3 pictures, 18 exercises in total. Topics are Benzenes and their reactions

No -I ab 0 CH3 Br

Answer 1

1) Aromatic compounds can be charged. Hence answer is option b) False.

2) Option a and b are aromatic as they follow all the rules. Whereas, option c and e contain 8-pi electrons so does not follow 4n+2 rule hence these are not aromatic. Option d) does not have conjugation across the ring hence it is not aromatic. Thus answer is option a and b.

3) 1-Bromo-2,4-dimethyl benzene

4) All atoms must need to have orbital p, perpendicular to the ring to have across the conjugation and hence answer is a) True.

5) b) m-nitrophenol

6) The only option a) is aromatic.
b) is not conjugated, c and d) do not follow the 4n+2 pi-electron rule.

7) The aromatic molecules can have other atoms such as nitrogen as well. Hence answer is b) False.

8) b) 4n+2 pi-electrons.

1) b) 4n+2 pi-electrons.

2) c) Cl2, AlCl3 where AlCl3 acts as a Lewis acid to polarize the Cl-Cl bond.

3) e) donates electron density to the resonant benzene ring and stabilizes ortho and para position.

4) d) NO2+

5) Methyl group of toluene is electron-donating via inductive effect and hence it is ortho/para orienting group. An answer is an option a and d.

6) a) OCH3 because methoxy group can donate electron density via resonance effect. And the resonance effect is stronger than the inductive effect.

7) c) Methyl benzene. The Methyl group is an activating group via the inductive effect.

1) This is an aromatic nucleophilic substitution reaction and hence gives 2,4-dinitrophenol. The answer is option d).

2) a) faster than benzene nitration and the product is ortho and para.

3) d) Benzyne

4) Bromine also has lone pairs and can donate via resonance effect and hence it is ortho/para directing. The Answer is an option a).