Identify the heteroatom and the number of double bonds present in furan,respectively.

The number of $\pi$-bonds and lone pair$(s)$ present in the major benzenoid product,which is formed when benzene reacts with acetyl chloride in the presence of anhydrous aluminium chloride,are respectively:

The main product of the following reaction will be

What do you mean by ortho and para directing groups? Explain the ortho and para directing effect by taking the example of any group.

Identify the product $P$ obtained in the following reaction:
$\text{Benzene} + \text{Ozone (excess)}$ $\xrightarrow{CCl_4} \text{Benzene triozonide}$ $\xrightarrow{Zn/H_2O} P + H_2O_2$

Aromatic hydrocarbons mostly exhibit .......