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Tuesday, 21 April 2026
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A colourless organic compound X was burnt in excess air to give two colourless and ...

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?
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  • A CO2 and NH3
  • B CO and NH3
  • C SO2 and H2O
  • D CO2 and H2O
  • E SO2 and NH3
Correct Answer: Option D
Explanation:
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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