Q10 of 33 Page 225

Write a balanced equation using the correct symbols for these chemical reactions:

i) Action of hydrogen on ethene in the presence of nickel catalyst.


ii) Combustion of methane evolving carbondioxide and water.


iii) Dehydrogenation of ethanol.


iv) Decarboxylation of Sodium salt of ethanoic acid.


i) When hydrogen reacts with ethene (unsaturated hydrocarbon) in the presence of nickel catalyst, it gives ethane (saturated hydrocarbon). The reaction takes place given below:



ii) Combustion of methane evolving carbon dioxide and water:


CH4 + 2O2→ CO2 + 2H2O


iii) When the vapour of ethanol is passed over heated copper catalyst at 573 K, it is dehydrogenated to acetaldehyde. This reaction is called dehydrogenation reaction.



iv) Decarboxylation (Removal of CO2) : When sodium salt of ethanoic acid is heated with soda lime (solid mixure of 3 parts of NaOH and 1 part of CaO), methane gas is formed.



More from this chapter

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8

Ethanoic acid is a member of Homologous series with general formula

CnH2n+1 COOH.


i) Name the series and give its functional group.


ii) Give the molecular formula and the common name of ethanoic acid.


iii) If this compound is mixed with ethanol in the presence of Conc.H2SO4, a sweet smelling compound is formed. Give the equation and name the compound.


iv) Ethanoic acid reacts with carbonates. Which gas is liberated during this reaction?


v) Write the balanced equation for the reaction of ethanoic acid with carbonate.


vi) Your grandmother has prepared mango pickle. What has she added to preserve it for a long time?


 9

i) Identify A & B.


ii) Convert ethanol into power alcohol. Mention one of its uses.


iii) What should be added to obtain denatured spirit?


iv) Give one use of denatured spirit.


 11

Look at the picture and identify what happens. Support your answer with equations.

i) How is B formed from A?



ii) What happens when acetic acid is treated with carbonate salt. Name the gas produced. What happens when this gas is treated with lime water?



iii) What happens when acetic acid is treated with ethanol in the presence of concentrated H2SO4? Give the equation.



 12

Organic compounds ‘A’ and ‘B’ are the isomers with the molecular formula C2H6O.

Compound ‘A’ produces hydrogen gas with sodium metal, whereas compound ‘B’ does not. Compound ‘A’ reacts with acetic acid in the presence of concentrated H2SO4 bto form compound ‘C’ with a fruity flavour. What are the isomers ‘A’, ‘B’ and the compound ‘C’?