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05/10/2021 5:56 pm
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(a) An organic compound X of molecular formula C2H4O2 gives brisk effervescence with sodium hydrogen carbonate. Give the name and formula of X.
(b) A mixture of ethyne (acetylene) and oxygen is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
(c) Name a chemical reaction which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes).
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05/10/2021 5:57 pm
(a) Ethanoic acid, CH3COOH gives brisk effervescence with sodium hydrogen carbonate.
(b) A mixture of ethyne and air is not used for welding because burning of ethyne in air produces a sooty flame (due to incomplete combustion) which is not hot enough to melt metals for welding.
(c) Addition reactions are a characteristic of unsaturated hydrocarbons.