(a) A saturated organic compound 'A' belongs to the homologous series of alcohols. On heating 'A' with…
(a) A saturated organic compound 'A' belongs to the homologous series of alcohols.
On heating 'A' with concentrated sulphuric acid at 443 K, it forms an unsaturated compound 'B' with molecular mass 28 u.
The compound 'B' on addition of one mole of hydrogen in the presence of Nickel, changes to a saturated hydrocarbon 'C'.
(i) Identify A, B and C.
(ii) Write the chemical equations showing the conversion of A into B.
(iii) What happens when compound C undergoes combustion ?
(iv) State one industrial application of hydrogenation reaction.
(v) Name the products formed when compound A reacts with sodium.
Solution
(a) (i) A: CH3CH2OH / Ethanol / Ethyl alcohol
B: CH2=CH2 / Ethene
C: CH3-CH3 / Ethane
(ii) CH3CH2OH $\xrightarrow{\text{conc. H2SO4, 443K}}$ CH2=CH2 (B) + H2O
(iii) Carbon dioxide and water are produced and a large amount of heat is released /
C2H6 + O2 → 2CO2 + 3H2O + Heat
(Award full marks even if equation is not balanced.)
(iv) Conversion of vegetable oil into fats.
(v) Sodium ethoxide and hydrogen