[P] +(Br2) → C2H4Br2 +(NaNH2)/(NH3) →Q
[Q] +(20%H2SO4) / (Hg2+, Δ) →[R] +(zn- Hg/HCl) → [S]
The species P, Q, R and S respectively are
(A) ethene, ethyne, ethanal, ethane
(B) ethane, ethyne, ethanal, ethene
(C) ethene, ethyne, ethanal, ethanol
(D) ethyne, ethane, ethene, ethanal