Question

Number of allylic carbon atoms present in the following compound is:

Answer 1

Hint: There are two types of carbon atoms in the aliphatic and aromatic compounds, i.e., allylic and vinylic carbon atoms. To find the allylic carbon atom, we have to see the double bond and the carbon atom which is attached to the carbon atom having the double bond will be the allylic carbon atom, and the carbon atom having the double bond is known as the vinylic carbon atom.

Complete answer:
We know that organic compounds are made up of carbon atoms, so there are many types of organic compounds, i.e., aliphatic carbon compounds and aromatic carbon compounds. If there is only a straight chain then it is known as an aliphatic carbon compound, and when there is a benzene ring present then it is an aromatic compound.
In these compounds, there are two types of carbon atoms present, i.e., allylic and vinylic carbon atoms. To find the allylic carbon atom, we have to see the double bond and the carbon atom which is attached to the carbon atom having the double bond will be the allylic carbon atom, and the carbon atom having the double bond is known as the vinylic carbon atom.
So, the given compound is an aromatic compound:

There are four double bonds in this compound. According to these double bonds, we can mark the allylic carbon atoms. These are marked and shown below:

So, there are 7 allylic carbon atoms present in it.

Note:
Don't get confused between the hybridization of the allylic carbon and vinylic carbon atom, as the hybridization of allylic carbon atom is $s{p}^3$ and the hybridization of vinylic carbon atom is $s{p}^2$.