Which of the following compounds does not undergo the Friedel-Crafts reaction?

The reagent used in Friedel-Crafts reaction is:

The correct order of reactivity towards electrophilic substitution for the compounds $(I)$ Aniline,$(II)$ Benzene,and $(III)$ Nitrobenzene 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?

The major product $B$ of the following reaction has . . . . . . . $\pi$-bonds.

Assertion : Cyclopentadienyl anion is much more stable than allyl anion.
Reason : Cyclopentadienyl anion is aromatic in character.