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प्रश्न
Explain the following reaction with an example.
Saponification
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उत्तर
When an ester is heated with dilute sodium hydroxide (an alkali) solution, it gets converted back to the original alcohol and sodium salt of the original carboxylic acid. Such a reaction is known as saponification.
\[\ce{Ester + Sodium hydroxide ->[Heat] Sodium carboxylate + Alcohol}\]
E.g. Ethyl ethanoate and sodium hydroxide react to give sodium ethanoate and ethanol.
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संबंधित प्रश्न
Complete the following chemical equation:
\[\ce{CH3COOC2H5 + NaOH ->}\]
A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
Complete the following chemical equations : C2H5OH`("Conc."H_2SO_4)/(443K)`>
What is the common name of methanoic acid?
What is the common name of methanol?
Describe a test for carboxylic acids.
How would you convert:
Propanol into propanoic acid.
Name the process in the given case and write the equations of the reactions involved.
When ethanoic acid reacts with sodium hydrogen carbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas. Y Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.
Vinegar is a solution of about:
(a) 5 to 8 per cent ethanoic acid in alcohol
(b) 5 to 8 per cent ethanoic acid in water
(c) 50 to 80 per cent ethanoic acid in water
(d) 50 to 80 per cent ethanoic acid in alcohol
If you are asked to report your observations about the following two properties of acetic acid, what would you report?
(i) Odour
(ii) Effect on litmus
Name the functional group present in the following compound:
C2H5CHO
On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes
(A) no reaction
(B) a colourless gas with pungent smell
(C) bubbles of a colourless and odourless gas
(D) a strong smell of vinegar
Acetic acid solution turns:
(1) blue litmus red
(2) red litmus blue
(3) blue litmus colourless
(4) red litmus colourless
On adding NaHCO3 to acetic acid, a gas is evolved which turns lime water milky due to the formation of:
(1) Calcium bicarbonate
(2) Calcium hydroxide
(3) Calcium carbonate
(4) Calcium acetate
Draw the structure formula of ethyne.
When sodium hydrogen carbonate is added to ethanoic acid, a gas evolves. Consider the following statements about the gas evolved.
- It turns lime water milky.
- It is evolved with brisk effervescence.
- It has a smell of burning sulfur.
- It is also a by-product of respiration.
Ethanoic acid is also known as which of these?
In the presence of the acid catalyst, ethanoic acid reacts with ethanol and ______ ester is produced.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
Write the chemical equation for the ethanol to ethanoic acid of an oxidation reaction.
