Question

What happens when -

1) acetylene passed through 40% solution of sulphuric acid in presence of mercuric sulphate.
2) 2-chloropropane heated with Na metal
3) Propene passed through hot conc. sol. of KMnO₄

Answer 1

1) Acetaldehyde is formed.
CH≡CH $\underset{{\mathrm{HgSO}}_4}{\overset{40\%{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}$ CH₃CHO

2) 2,3-Dimethylbutane is formed.
2CH₃-CH(Cl)-CH₃ $\stackrel{\mathrm{Na}}{\to }$ CH₃-CH(CH₃)-CH(CH₃)-CH₃

3) Ethanoic acid and CO₂ are formed.
CH₃CH=CH₂ + (hot acidified)KMnO₄ → CH₃COOH + CO₂ +H₂O