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प्रश्न
Explain the following reaction with an example.
Esterification
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उत्तर
Substances having ester as the functional group are formed by a reaction between a carboxylic acid and an alcohol. This reaction is known as esterification.
E.g. When ethanoic acid is heated with ethanol in a water bath in the presence of an acid catalyst (concentrated sulphuric acid), ethyl ethanoate and water are formed.
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संबंधित प्रश्न
The molecular formula of acetic acid is _________ .
(a) CH3COOH
(b) CH3 – CH3
(c) C6H6
(d) C2H4
For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap?
(a) Castor oil and calcium hydroxide
(b) Turpentine oil and sodium hydroxide
(c) Castor oil and sodium hydroxide
(d) Mustard oil and calcium hydroxide
Complete the following chemical equations : C2H5OH`("Conc."H_2SO_4)/(443K)`>
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
Name two oxidising agents which can oxidise ethanol to ethanoic acid.
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.
Name the reducing agent used to convert acetic acid into ethanol.
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.
While studying saponification reactions, the following comments were noted down by the students :
(I) Soap is a salt of fatty acids.
(II) The reaction mixture is basic in nature.
(III) In this reaction heat is absorbed.
(IV) This reaction is not a neutralisation reaction.
Which of these are the correct comments ?
(A) I and III only
(B) I, II and III
(C) II, III and IV
(D) I and II only
A student takes Na2CO3 powder in a test tube and pours some drops of acetic acid over it. He observes:
(A) no reaction in the test tube
(B) colourless gas with pungent smell
(C) bubbles of a colourless and odourless gas
(D) white fumes with smell of vinegar
Write the chemical equation for the following:
Combustion of methane
Using appropriate catalysts, ethane can be oxidized to an alcohol. Name the alcohol formed when ethane is oxidized.
Choose the correct answer:
Select the acid which contains four hydrozen atoms in it.
Write the characteristics of ethanoic acid.
Ethanoic acid turns ______ litmus to ______
Vinegar is a solution of ______.
Raina while doing certain reactions observed that heating of substance ‘X’ with a vinegar-like smell with a substance ‘Y’ (which is used as an industrial solvent.) in the presence of conc. Sulphuric acid in a water bath gives a sweet-smelling liquid ‘Z’ having molecular formula C4H8O2. When heated with caustic soda (NaOH), ‘Z’ gives back the sodium salt and the compound ‘Y’.
Identify ‘X’, ‘Y’, and ‘Z’. Illustrate the changes with the help of suitable chemical equations.
Give the balanced chemical equation of the following reaction:
Oxidation of ethanol by acidified potassium dichromate.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
