Preparation Method of Aromatic Hydrocarbons

Identify the number of reactions that can give benzene as the major product.

Benzene diazonium chloride on treatment with ${\mathrm{H}}_3{\mathrm{PO}}_2$ in the presence of cuprous ions gives

Which of the following compound reacts with heated zinc dust to form benzene?

Phenol reacts with heated zinc dust to form

Write the deprotonation reaction of arenium ion.

Heating a mixture of sodium benzoate and soda-lime gives

Product $\left(\mathrm{X}\right)$ is

Consider the following reaction,

Identify the product $\mathrm{B}$.

When acetylene is passed through a red-hot iron tube, a compound $\mathrm{X}$ is formed. Which one of the following reactions will yield $\mathrm{X}$ as the major product?