The hybridization involved in the six carbon atoms of benzene is

Which represents an intermediate formed in the reaction of toluene and chlorine at elevated temperature in sunlight?

In the reaction of benzene with dichloromethane $(CH_2Cl_2)$ in the presence of anhydrous $AlCl_3$,the intermediate product '$A$' is:

Product $(A)$ is

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

Suggest the best reaction conditions for the synthesis shown below.