Question

An organic liquid (A), containing C, H and O with boiling point : 78°C, and possessing a rather pleasant odour, on heating with concentrated sulphuric acid gives a gaseous product (B) – with the empirical formula, CH₂. ‘B’ decolourises bromine water as well as alkaline KMnO₄ solution and takes up one mole of H₂ (per mole of ‘B’) in the presence of finely divided nickel at high temperature. Identify the substances ‘A’ and ‘B’.

Answer 1

Answer:

Correct option is

C

C2H5OH, C2H4

C2H5OH or ethyl alcohol when treated with concentrated H2SO4 undergoes dehydration to form ethene(C2H4). Ethane reacts with alkaline KMnO4 undergoes oxidation to form ethylene glycol. Ethene  undergoes hydrogenation in presence of nickel heads of one mole of H2 to form ethane.