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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
When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation?
(A) No reaction takes place
(B) A colourless gas with pungent smell is released with brisk effervescence
(C) A brown coloured gas is released with brisk effervescence
(D) Formation of bubbles of a colourless and odourless gas
Choose the correct alternative and rewrite the following:
Acetic acid ..................
Draw the structure of butanoic acid.
What is an oxidising agent?
How is ethanoic acid obtained from ethanol? Write down the chemical equation of the reaction involved.
The structural formula of an ester is :
Write the formula of the acid and the alcohol from which it is formed.
Name the product formed and give the appropriate chemical equation for the following:
Sodium reacting with ethyl alcohol.
Write the names of the first three members of the carboxylic acid series.
A student is studying the properties of acetic acid in his school laboratory. List two physical and two chemical properties which he must observe and note in his record book.
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations.
Explain the following term with example.
Monomer
Explain the following term with an example.
Oxidant
Write the chemical equation for the following:
Combustion of methane
Identify the term or substance based on the descriptions given below:
Hydrocarbon containing a triple bond used for welding purposes
Convert ethane to acetic acid.
Ethanoic acid _________.
Ester is a sweet-smelling compound.
Bubbles are seen in the test tube during the preparation of lime water.
Write the chemical equation for the ethanol to ethanoic acid of an oxidation reaction.
