Which of the following compounds will not undergo Friedel-Craft's reaction easily?

Which of the following is a Fittig reaction?

In which of the following compounds does electrophilic attack occur at ortho and para positions?

Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because

Consider the following compounds:
$a$: Chlorobenzene
$b$: Nitrobenzene
$c$: Anisole
Arrange these compounds in the increasing order of reactivity towards electrophilic aromatic substitution (nitration).

What will be the major product $A$ in the following reaction?