Chemistry - GOC Question with Solution | TestHub

(P) Guanidine is a highly powerful base because its protonated form (conjugate acid) is heavily stabilized by three equivalent resonating structures, matching with (1) and (5).

(Q) $CC{l}_3^{-}>C{F}_3^{-}$ stability arises because chlorine has vacant 3d-orbitals that allow stabilizing d-orbital resonance ($p\pi -d\pi$ back-bonding) with the carbanion lone pair, matching with (3).

(R) Alkynes are more acidic than alkenes because the sp-hybridized carbon in alkynes has greater s-character (50%) than the sp² carbon in alkenes (33.3%), making it more electronegative, matching with (2).

(S) Cyclopentadiene is more acidic than cyclopropene because losing a proton forms the aromatic cyclopentadienyl anion ($4n+2\pi$ electrons), which is highly stable and has five identical resonance structures, matching with (4) and (5).

Correct Option: (B) (P $\to$ 1,5; Q $\to$ 3; R $\to$ 2; S $\to$ 4,5)