Which of the following is the product of Fittig reaction?

Arrange the following compounds in increasing order of their dipole moment:
$(I)$ Toluene
$(II)$ $m$-Dichlorobenzene
$(III)$ $o$-Dichlorobenzene
$(IV)$ $p$-Dichlorobenzene

The main product of the following reaction will be:

The catalyst used in Raschig's process is

The reaction shown below is an example of Nucleophilic Aromatic Substitution. Which of the following halides $(-X)$ is most readily replaced?

Provide the following electrophilic substitution reactions of aryl halides:
$(i)$ Halogenation
$(ii)$ Nitration
$(iii)$ Sulphonation
$(iv)$ Friedel-Crafts reaction