Q8 of 33 Page 225

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?


i) The given is a member of homologues series of carboxylic acid.


Its functional group is carboxylic.


ii) Ethanoic acid:


Molecular formula: CH3COOH


Common name: Acetic acid


iii) Ethanoic acid reacts with ethanol in the presence of concentrated H2SO4, a sweet smelling compound “ester” is formed. The reaction taking place:



The above process is called esterification.


iv) Ethanoic acid reacts with carbonates and bicarbonates and produces brisk effervescence due to the evolution of carbon dioxide.


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


2CH3COOH + Na2CO3→ 2CH3COONa + CO2↑ + H2O


vi) She has added vinegar to preserve it for long time. Acetic acid is used for making vinegar.


More from this chapter

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6

Ethanol is heated with excess concentrated H2SO4 at 443K.

i) Name the reaction that occurs and explain it.


ii) Write the equation for the above reaction.


iii) What is the product formed? What happens when this gas is passed through bromine water?


iv) When ethanol vapour is passed through bromine water, why does no change occur?


 7

Complete the following table:

 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.