A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).

Y and Z are respectively?

  • A CO2 and NH3
  • B CO and NH3
  • C SO2 and H2O
  • D CO2 and H2O
  • E SO2 and NH3
jamb 1985chemistry

The correct answer is D. CO2 and H2O

All saturated hydrocarbons are attacked by oxygen at elevated temperatures and, if oxygen is in excess, complete combustion to carbon dioxide and water occurs.

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