Question:
Which one of the following is not aromatic?
Which one of the following is not aromatic?
Updated On: Apr 29, 2024
- Cyclopentadienyl anion
- Cycloheptatrienyl cation
- Cyclooctatetraene
- Thiophene
Hide Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Cyclooctatetraene is not aromatic in nature. In cyclooctatetraene, delocalisation of $ \pi - $ electrons takes place but Huckel's rule is not followed. According to Huckel's rule, it should contains $ 10\pi (4n+2) $ electrons but it contains only $ 8\pi $ electrons.
$ \pi $ electron $ (8)\ne (4n+2)=10 $ (i.e., Huckel rule is not followed), hence it is not aromatic.
$ \pi $ electron $ (8)\ne (4n+2)=10 $ (i.e., Huckel rule is not followed), hence it is not aromatic.
Was this answer helpful?
0
0
Top Questions on Hydrocarbons
- The alkane from below having two secondary hydrogens is:
- JEE Main - 2025
- Chemistry
- Hydrocarbons
- An alkene ‘X’ (C\(_4\)H\(_8\)) does not exhibit cis/trans isomerism. Reaction of ‘X’ with Br\(_2\)/CCL\(_4\), followed by reaction with reagent ‘Y’ gave ‘Z’ (C\(_6\)H\(_6\)). What are ‘Y’ and ‘Z’ respectively?
- TS EAMCET - 2024
- Chemistry
- Hydrocarbons
- In the following table, match the reactants given in List-I with the correct product in.List-II as per the reaction of hydration of alkene under acidic conditions.
- CUET (UG) - 2024
- Chemistry
- Hydrocarbons
- Identify the correct answer
- NEET (UG) - 2024
- Chemistry
- Hydrocarbons
Major products A and B formed in the following reaction sequence , are
- NEET (UG) - 2024
- Chemistry
- Hydrocarbons
View More Questions
Questions Asked in JKCET exam
- A force $ F = 3x^2 + 2x + 1 $ acts on a body in the $ x $ -direction. The work done by this force during a displacement from $ x = -1 $ to $ +1 $ is
- JKCET - 2019
- work, energy and power
- A moving block having mass $m$, collides with another stationary block having mass $4\,m$. The lighter block comes to rest after collision. When the initial velocity of the lighter block is $v$, then the value of coefficient of restitution (e) will be
- JKCET - 2019
- work, energy and power
- What is the colour of the flame on heating potassium in the flame of a Bunsen burner?
- JKCET - 2019
- GROUP 1 ELEMENTS
- If $ a $ , $ b $ , $ c $ are the lengths of three edges of unit cell, $ \alpha $ is the angle between side $ b $ and $ c $ , $ \beta $ is the angle between side $ a $ and $ c $ and $ \gamma $ is the angle between side $ a $ and $ b $ , what is the Bravais Lattice dimensions of a tetragonal crystal?
- JKCET - 2019
- The solid state
- Which of the following compounds is known as copper glance?
- JKCET - 2019
- General Principles and Processes of Isolation of Elements
View More Questions
Concepts Used:
Hydrocarbons
Hydrocarbons can be described as organic compounds that consists only hydrogen and carbon atoms. These compounds are of different types and thereby have distinct natures. Hydrocarbons are colorless gases and are known for discharging faint odours. These have been categorized under four major classes named as alkynes, alkanes, alkenes, and aromatic hydrocarbons.
Types of Hydrocarbons
- Saturated hydrocarbons - Saturated hydrocarbons are those compounds where there is a single bond exists between carbon atoms and are saturated with atoms of hydrogen.
- Unsaturated hydrocarbons - Hydrocarbons comprises of at least one double or triple bond between carbon atoms are known as unsaturated hydrocarbons.
- Aliphatic hydrocarbons - The term denotes the hydrocarbons formed as an outcome of the chemical degradation of fats. Aliphatic hydrocarbons are basically chemical compounds.
- Aromatic hydrocarbons - They are distinguished because of the presence of benzene rings in them. They give away distinct types of aroma. These hydrocarbons comprises of only hydrogen and carbon atoms.