COMEDK 2025 Afternoon Solved Paper

Concept:This question matches organic reactions with their correct products using reduction, isomerisation, ozonolysis, and hydration.Explanation:Reaction A: $1$-Chloropropane $(\mathrm{CH_3CH_2CH_2Cl})$ with $\mathrm{Zn/HCl}$ undergoes reduction to give propane $(\mathrm{CH_3CH_2CH_3})$. This matches R.Reaction B: $n$-Hexane with anhydrous $\mathrm{AlCl_3}$ and $\mathrm{HCl}_{(\mathrm{g})}$ undergoes isomerisation to form a mixture of $2$-methylpentane and $3$-methylpentane. This matches S.Reaction C: $2$-Methylpropene $(\mathrm{(CH_3)_2C=CH_2})$ undergoes reductive ozonolysis with $\mathrm{O_3}$ followed by $\mathrm{Zn/H_2O}$ to yield propanone $(\mathrm{CH_3COCH_3})$ and methanal $(\mathrm{H_2CO})$. This matches P.Reaction D: Propyne $(\mathrm{CH_3C\equiv CH})$ with $\mathrm{HgSO_4/H_2SO_4}$ at $333\ \mathrm{K}$ undergoes hydration (Markovnikov addition) to form an enol, which tautomerises to propanone. This matches Q.Thus the correct pairing is A–R, B–S, C–P, D–Q.Answer:Option A: $A-R\ B-S\ C-P\ D-Q$