In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

For the given molecule, "x", the preferred site for the attack of the electrophile is :

Match List - I with List - II.

Choose the correct answer from the options given below :

Consider the three aromatic molecules (P, Q and R) whose structures have been given below :

The correct order regarding the reactivity of these compounds with $$ \mathrm{Ph}-\underset{(+)}{\mathrm{N}} \equiv \mathrm{~N} \mathrm{Cl}^{(-)} $$ under optimum but slightly acidic medium is :