Q11 of 33 Page 225

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.



i. Preparation of ethanoic acid from ethanol:


Ethanol undergoes oxidation with KMnO4 to form a carboxylic acid, i.e., ethanoic acid.


The reaction takes place is given below:



ii. Ethanoic acid reacts with sodium bicarbonate, it gives brisk effervescence of carbon dioxide.


The reaction of ethanoic acid with a carbonate (Na2CO3) is:



When the released gas is treated with limewater, it turns


milky.


iii. When acetic acid is treated with ethanol in the presence of concentrated H2SO4, it forms a sweet smelling substance called ester. This reaction is called esterification.



More from this chapter

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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.


 10

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.


 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’?


 13

Organic compound ‘A’ of molecular formula C2H6O liberates hydrogen gas with sodium metal. ‘A’ gives ‘B’ of formula C4H10O, when it reacts with concentrated H2SO4 at 413K. At 443K with concentrated H2SO4 ‘A’ gives compound ‘C’ of formula C2H4. This compound ‘C’ decolourises bromine water. What are ‘A’, ‘B’ and ‘C’?