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A compound C(molecular formula, C2H4O2) reacts with Na – metal to form a compound Rand evolves into a gas which burns with a pop sound. Compound C on treatment with an alcohol Ain presence of an acid forms a sweet-smelling compound S (molecular formula, C3H6O2). On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back RandA. Identify C,R,A,S and write down the reactions involved?


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Solution

Identification of the compounds C,R,A,S and their chemical reactions:

  • Here Compound 'C' is Ethanoic acid which is known to have a molecular formula
  • It reacts with sodium to form Sodium ethanoate which is denoted as the compound 'R' and the evolved hydrogen gas during the reaction burns with a pop sound.
  • The chemical equation related to the above reaction can be given as:
    2CH3COOH(s)EthanoicacidC+2Na(s)Sodium2CH3COONa(s)SodiumethanoateR+H2(g)Hydrogengas
  • Further, when Ethanoic acid reacts with methanol in the presence of an acid, it forms methyl ethanoate ester which is a sweet-smelling substance with the molecular formula, C3H6O2.
  • Here, compound S is Methyl ethanoate and A is Methanol.
  • The chemical equation related to the above reaction can be given as:
  • CH3COOH(aq)EthanoicacidC+CH3OH(aq)MethanolAacidCH3COOCH3(aq)Methylethanoates+H2O(l)Water
  • When sodium hydroxide is added to ethanoic acid, it gives Sodium ethanoate (S) and water.
  • The chemical equation related to the above reaction can be given as:
    CH3COOH(aq)EthanoicacidC+NaOH(aq)SodiumhydroxideCH3COONa(aq)SodiumethanoateR+H2O(l)Water
  • When Methyl ethanoate(S) is treated with NaOH solution, it gives back Methanol and Sodium ethanoate as compounds A and R respectively.
  • The chemical equation related to the above reaction can be given as:
    CH3COOCH3(aq)MethylethanoateS+NaOH(aq)SodiumhydroxideCH3OH(aq)MethanolA+CH3COONa(aq)SodiumethanoateR

Hence,

Compound C is CH3COOH (Ethanoic acid).
Compound R is CH3COONa (Sodium ethanoate).
Compound A is CH3OH (Methanol).
Compound S is CH3COOCH3​ (Methyl ethanoate).


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