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प्रश्न
Explain the following reaction with an example.
Saponification
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
A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:
(a) There is no change in the blue litmus paper and the red litmus paper turns white.
(b) There is no change in the red litmus paper and the blue litmus paper turns red.
(c) There is no change in the blue litmus paper and the red litmus paper turns blue.
(d) No change in colour is observed in both the litmus papers
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
Give the name and structural formula of one homologue of HCOOH.
Three organic compounds A, B and C have the following molecular formulae: C4H10O
Which compound contains a carboxyl group? Write its name and structural formula.
What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of conc. H2SO4?
An organic compound X of molecular formula C2H4O2 gives brisk effervescence with sodium hydrogen carbonate. Give the name and formula of X.
Write the names of three compounds which can be oxidised directly or in stages to produce acetic acid.
Give the structural formulae of acetic acid.
Acetic acid is a typical acid. Write one equation in case of its reactions with a bicarbonate.
Name the compound formed when acetic acid and ethanol react together?
What do you observe when acetic acid is added to ethyl alcohol in the presence of sulphuric acid?
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
Explain the following term with an example.
Oxidant
Draw the structural formula of a compound with two carbon atoms in the following case:
An alcohol containing two carbon atoms.
State how the following conversions can be carried out:
Ethyl alcohol to Ethane
Rewrite the following statement by selecting the correct option.
The formula of ethanoic acid is _____________.
A student while observing the properties of acetic acid would report that this smells like ______.
When ethanoic acid is treated with NaHCO^ the gas evolved is ______.
What happens when a small piece of sodium is dropped in ethanol? Write the equation for this reactions.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
