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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
In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time he is likely to observe that
(A) a colloid is formed in the test tube.
(B) the ethanoic acid dissolves readily in water.
(C) the solution becomes light orange.
(D) water floats over the surface of ethanoic acid.
What do you observe when you drop a few drops of acetic acid to test tubes containing
(a) phenolphthalein
(b) distilled water
(c) universal indicator
(d) sodium hydrogen carbonate powder
How esters are prepared ?
Give balanced chemical equations for Sodium ethanoate to methane.
Fill in the blanks from the choices given within brackets:
The basicity of acetic acid is-------- (3, 1, 4).
Write the formulae of ethanoic acid.
What type to compound is CH3COOH?
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
What do you notice when acetic acid reacts with alkalies?
Acetic acid is a typical acid. Write one equation in case of its reactions with a bicarbonate.
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
Choose the correct answer:
Select the acid which contains four hydrozen atoms in it.
State the observation
When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.
Choose the correct alternative and rewrite the following:
Some acetic acid is treated with solid NaHCO3, the resulting solution will be _________________.
Explain the following reaction with an example.
Esterification
Bubbles are seen in the test tube during the preparation of lime water.
Write the chemical equation for the following:
Saponification Reaction
Write the chemical equation for the ethanol to ethanoic acid of an oxidation reaction.
Give the balanced chemical equation of the following reaction:
Combustion of ethanol.
Give the balanced chemical equation of the reaction.
Oxidation of ethanol by acidified potassium dichromate.
