What is the number of $\pi$ bonds in naphthalene?

Cyclic hydrocarbon molecule $A$ has all the carbon and hydrogen atoms in a single plane. All the carbon-carbon bonds are of the same length and are less than $1.54 \ \mathring{A}$ but more than $1.34 \ \mathring{A}$. The $C-C-C$ bond angle will be:

Answer the following question: Explain which type of mechanism is involved in the alkylation of benzene?

When chlorine is passed through warm benzene in the presence of sunlight,the product obtained is:

Arrange the following compounds in their correct order of reactivity towards electrophilic substitution reaction:

The product of the following reaction is: