Question

(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).

Answer 1

Explanation:

(a) Ethanoic acid also called acetic acid $CH_{3}COOH$ gives brisk effervescence when reacts chemically with sodium hydrogen carbonate.  

b) When ethyne is heated in the presence of air incomplete burning takes place (sooty flame) because of limited supply oxygen. That flame produced is not hot enough for melting metals and it is not used for welding .

c) Addition reaction is the one which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes)

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