
Which of the following is a non-aromatic compound?
A.
B.
C.
D.




Answer
486k+ views
Hint: Aromatic compounds are those that obeys Huckel’s rule, are planar and will show cyclic delocalisation. Huckel’s rule is , where n is the number of benzene rings. For n=1, there should be 6 pi electrons. For n=2, there should be 10 pi electrons and so on.
Complete Solution :
- A.
There are carbonyl pi electrons present, but these do not resonate within the ring, that’s why they are not aromatic. Second reason is that there is also no proper conjugation present, and only cross conjugation is present. It doesn’t obey Huckel’s rule for aromaticity. Hence, it is a non-aromatic compound.
- B.
It is having 10 pi electron, and is an aromatic compound as it obeys Huckel’s rule :
- Here, we can see that as n= 2, that two rings are present and there are 10pi electrons, hence it is an aromatic compound.
- C.
In this we can see that, there are two pi bonds, so there are four pi electrons. Hence, it will not obey Huckel’s rule :
As there are 4 pi electrons, it will not be aromatic.
- It is anti- aromatic compound. Anti-aromatic are not non-aromatic compounds. They are also planar like aromatic compounds and also have conjugated double bonds but the number of pi electrons are 4n not 4n+2 which is an essential criteria for aromatic compounds according to the Huckel’s rule. So they are called anti-aromatic compounds.
- D.
Here a lone pair of electrons are present on oxygen, which will delocalise the benzene ring, hence there are six pi electrons present that are two pi bonds and one lone pair of electrons.
That’s why it will obey Huckel’s rule :
We can say that it is aromatic compound as it obeys Huckel’s rule
So, the correct answer is “Option A”.
Note: - We can say that an aromatic compound is one which obeys the criteria’s like:
- It should have the capability to undergo substitution instead of addition reactions.
- It must follow Huckel’s rule that is
- It must be cyclic, planar structure
- It must have stability due to the pi electron delocalization.
Complete Solution :
- A.

There are carbonyl pi electrons present, but these do not resonate within the ring, that’s why they are not aromatic. Second reason is that there is also no proper conjugation present, and only cross conjugation is present. It doesn’t obey Huckel’s rule for aromaticity. Hence, it is a non-aromatic compound.
- B.

It is having 10 pi electron, and is an aromatic compound as it obeys Huckel’s rule
- Here, we can see that as n= 2, that two rings are present and there are 10pi electrons, hence it is an aromatic compound.
- C.

In this we can see that, there are two pi bonds, so there are four pi electrons. Hence, it will not obey Huckel’s rule
As there are 4 pi electrons, it will not be aromatic.
- It is anti- aromatic compound. Anti-aromatic are not non-aromatic compounds. They are also planar like aromatic compounds and also have conjugated double bonds but the number of pi electrons are 4n not 4n+2 which is an essential criteria for aromatic compounds according to the Huckel’s rule. So they are called anti-aromatic compounds.
- D.

Here a lone pair of electrons are present on oxygen, which will delocalise the benzene ring, hence there are six pi electrons present that are two pi bonds and one lone pair of electrons.
That’s why it will obey Huckel’s rule
We can say that it is aromatic compound as it obeys Huckel’s rule
So, the correct answer is “Option A”.
Note: - We can say that an aromatic compound is one which obeys the criteria’s like:
- It should have the capability to undergo substitution instead of addition reactions.
- It must follow Huckel’s rule that is
- It must be cyclic, planar structure
- It must have stability due to the pi electron delocalization.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Earth rotates from West to east ATrue BFalse class 6 social science CBSE

The easternmost longitude of India is A 97circ 25E class 6 social science CBSE

Write the given sentence in the passive voice Ann cant class 6 CBSE

Convert 1 foot into meters A030 meter B03048 meter-class-6-maths-CBSE

What is the LCM of 30 and 40 class 6 maths CBSE

What is history A The science that tries to understand class 6 social science CBSE

Trending doubts
Father of Indian ecology is a Prof R Misra b GS Puri class 12 biology CBSE

Who is considered as the Father of Ecology in India class 12 biology CBSE

Enzymes with heme as prosthetic group are a Catalase class 12 biology CBSE

A deep narrow valley with steep sides formed as a result class 12 biology CBSE

An example of ex situ conservation is a Sacred grove class 12 biology CBSE

Why is insulin not administered orally to a diabetic class 12 biology CBSE
