Aromaticity Practice Test Online Quiz

1. Which of the following is not a characteristic feature of arenes?

Resonance stabilization

Greater reactivity towards electrophilic substitution

Electrophilic additions

Delocalisation of π-electrons

2. Which symbol correctly represents the relationship between the two resonating Kekule structures of benzene?

↔

→

≡

⇌

3. What is the approximate bond length of C-C bonds in benzene?

110 picometers (pm)

156 picometers (pm)

139 picometers (pm)

149 picometers (pm)

4. Which statement about electrophilic substitution is incorrect?

-NO2 is deactivating and m-directing

-Cl is activating and o, p-directing

-OH is activating and o, p-directing

-CH3 is activating and o, p-directing

5. Which species acts as the reactive species in the nitration of benzene?

NO2⁺

NO2⁻

NO3

HNO3

6. What contributes to the formation of the delocalized π system in benzene?

Fusion of 6 sp² hybridized orbitals

Overlapping of 3 p orbitals from each carbon atom

Interaction of 6 atomic s orbitals

Conjugation of 6 d orbitals

7. What is the classification of cyclohepta-1,3,5-triene in terms of its aromaticity?

Aromatic

Nonaromatic

Antiaromatic

Quasiaromatic

8. Which among the following compounds is Not a Lewis acid?

BF3

R-OR

R-MgX

FeBr3

9. Which method represents the best strategy to perform alkylation of benzene without causing overalkylation?

Friedel-Crafts alkylation

Friedel-Crafts acylation followed by reduction

Halogenation followed by a SN2

Friedel-Crafts acylation without reduction

10. What constitutes the initial step in the halogenation of benzene?

Formation of a carbocation intermediate

Generation of a halogen cation

Formation of an electrophilic species

Creation of a radical intermediate

11. During which chemical process does the Meisenheimer complex play a significant role?

Radical polymerization reactions

Nucleophilic aromatic substitution reactions

Oxidation of alcohols to aldehydes

Fischer esterification reactions

12. Which compound exhibits unusual aromaticity, displaying 3D aromaticity instead of the typical planar aromatic systems?

Benzene

Cyclobutadiene

Cyclooctatetraene

Pyridine

13. What criterion must the number of π-electrons in a monocyclic, planar compound satisfy to demonstrate aromaticity?

Odd number of π-electrons

Specific mathematical rule: n=4x+2

Specific mathematical rule: n=2x+2

Symmetrical substituent arrangement

14. Which intermediate is typically formed during elimination-addition reactions?

Benzyne intermediate

Carbocation

Carbanion

Zwitterionic intermediate

15. Which statement does NOT apply to anti-aromatic molecules?

The molecules satisfy Hückel's rule

They usually contain a planar, cyclic conjugated system

They exhibit higher reactivity compared to aromatic compounds

These molecules are destabilized due to electron delocalization

16. Which experimental technique is commonly used to analyze the aromaticity of a molecule?

Nuclear Magnetic Resonance (NMR) spectroscopy

Gas Chromatography-Mass Spectrometry (GC-MS)

X-ray crystallography

Infrared (IR) spectroscopy

17. What defines an anti-aromatic compound compared to aromatic and non-aromatic ones?

Higher stability due to fully conjugated systems

Planar with even π-electrons following Hückel's rule

Reduced reactivity compared to other compounds

Typically a ring structure with 4n π-electrons causing destabilization

18. Which characteristic does not necessarily exclude a compound from being aromatic?

Non-planarity

Lack of resonance

Presence of steric hindrance

Odd number of π-electrons

Test Name:	Aromaticity Practice Test
Subject Category:
Test Type:	Multiple Choice Questions
Total Score / Questions:	18 / 18
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.