Name the functional group present in an organic compound which gives brisk effervescence with NaHCO₃•

1 Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas? 2 Which of the following will give brisk effervescence with sodium hydrogen carbonate and why?

CH₃COOH, CH₃CH₂OH

4 Name the hydrocarbon formed when ethanol is heated with cone. H₂S0₄ at 170 �C? What is this reaction known as? 5 Why does ethyne (acetylene) burn with a sooty flame?