Chemistry - GOC Question with Solution | TestHub

(P) Naphthalene exhibits resonance (3), complete cyclic conjugation (4), and is a polycyclic aromatic hydrocarbon (5), giving $P\to 3,4,5$.

(Q) Ethanol has a degree of unsaturation (DU) of 0 and features a non-delocalized, localized lone pair on the oxygen atom (2), giving $Q\to 2$.

(R) Aniline has DU = 4 (1 ring + 3 double bonds), undergoes resonance with its amine lone pair (3), has cyclic conjugation (4), and is aromatic (5), giving $R\to 1,3,4,5$.

(S) Benzene has DU = 4 (1 ring + 3 double bonds), displays resonance (3), continuous cyclic conjugation (4), and is aromatic (5), giving $S\to 1,3,4,5$.