From homologous series (3 member) starting from acetic acid ( CH3COOh)
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12th
Chemistry
Aldehydes, Ketones and Carboxylic Acids
Chemical Reactions of Carboxylic Acids
Ethanoic acid is a member o...
CHEMISTRY
Ethanoic acid is a member of homologous series with general formula C
n
H
2n+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.H
2
SO
4
, 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?
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ANSWER
Ethanoic acid CH
3
COOH
i) The series are carboxylic acid series and the name of the functional group is carboxylic acid.
ii) Molecular formula of Ethanoic acid is- CH
3
COOH
Common name- Acetic acid.
iii) Refer above image.
Acetic acid with ethanol in presence of H
2
SO
4
gives esters. This process is called Esterification. A sweet smelling compound is Ethyl Acetate (Ester).
iv) Ethanoic acid reacts with carbonates and gives CO
2
.
2CH
3
COOH+Na
2
CO
3
⟶2CH
3
COONa+CO
2
+H
2
O
v) Balanced Equation is:
2CH
3
COOH+Na
2
CO
3
⟶2CH
3
COONa+CO
2
+H
2
O
vi) To preserve the food usually Na−Benzoate is used. Sometimes Vinegar is also used which is nothing but acetic acid.
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Answer:
CH3–COOH : Ethanoic acid (acetic acid)
CH3–CH2–COOH : Propanoic acid
CH3–CH2–CH2–COOH : Butanoic acid
Explanation:
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