Chemistry - GOC Question with Solution | TestHub

Compound (I) is Pyridine (C₅H₅N): It is heterocyclic (R) because of the Nitrogen atom, has 11 $\sigma$-bonds (5 C-H + 6 ring bonds, which is odd - T), and a Degree of Unsaturation of 4 (3 $\pi$-bonds + 1 ring - U).

Compound (II) is Cyclohexane (C₆H₁₂): It is homocyclic (P), a hydrocarbon (Q), and contains 0 $\pi$-bonds (0 is an even number - S).

While Cyclohexane has 18 $\sigma$-bonds (even), Option (A) is the only choice that correctly identifies the specific characteristics (R, T, U) for Pyridine. Therefore, the correct match is (A) I-(R, T, U), II-(P, Q, S, T).