How Esters Are Prepared ? - Science

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How esters are prepared ?

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Solution

Esters are formed when an alcohol reacts with a carboxylic acid in the presence of an acidf catalyst.

Concept: Ethanoic Acid
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2013-2014 (March) Delhi Set 3

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RELATED QUESTIONS

Ethanoic acid has a .................... odour.
(a) Rotten eggs
(b) Pungent
(c) Vinegar-like
(d) Mild


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


Consider the following comments about saponification reactions:

I. Heat is evolved in these reactions.

II. For quick precipitation of soap, sodium chloride is added to the reaction mixtures.

III. Saponification reactions are a special kind of neutralisation reactions.

IV. Soaps are basic salts of long-chain fatty acids.

The correct comments are

(a) I, II and III

(b) II, III and IV

(c) I, II and IV

(d) Only I and IV


You have four test tubes, A, B, C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/ test tubes would be suitable for the correct test of acetic/ethanoic acid?

(a) only A
(b) A and B
(c) B and C
(d) A and D


Identify the term or substance based on the descriptions given below

Ice like crystals formed on cooling an organic acid sufficiently.


Give balanced chemical equations for Sodium ethanoate to methane.


Choose the correct alternative and rewrite the following: 

Acetic acid ..................


When zinc powder is added to acetic acid ______________

(a) the mixture becomes warm
(b) a gas is evolved
(c) the colour of the mixture becomes yellow
(d) a solid settles at the bottom


Draw the structure of butanoic acid.


What is an oxidising agent? 


An organic acid X is a liquid, which often freezes during winter time in cold countries, having the molecular formula C2H4O2. On warming it with methanol in the presence of a few drops of concentrated sulphuric acid, a compound Y with a sweet  smell is formed.
(a) Identify X and Y. Also write their formulae showing the functional group present in them.
(b) Write a chemical equation for the reaction involved.


Give the structural formulae of acetic acid? IUPAC name of acetic acid. What is glacial acetic acid?


What do you notice when acetic acid reacts with litmus ?


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.


Name the functional group present in the following compound:
HCOOH


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 


Explain the following term with example.
Monomer


Explain the following term with example.

Reduction


Explain the following term with an example.

Oxidant


Why is Soda lime used not only NaOH?


Write the important uses of acetic acid.


What is the main constituent of vinegar?


What is thr boilng point of acetic acid?


How will you carry out the following conversions?

Ethene to acetic acid


State are relevant observations for following reactant:

Addition of ethyl alcohol to acetic acid in presence of conc. H2SO4


Ethanoic acid _________.


Choose the correct alternative and rewrite the following:

Some acetic acid is treated with solid NaHCO3, the resulting solution will be _________________.


Rewrite the following statement by selecting the correct option.
The formula of ethanoic acid is _____________.


CH3–CH2–CHO : propanal : : CH3–COOH : _______


Ketone : –CO– : : Ester : _______


Write the molecular formula of the given compound.

Sodium ethanoate


Write the molecular formula of the given compound.

Ethanoic acid


Ester is a sweet-smelling compound.


Explain the following reaction with an example.

Esterification


Explain the following reaction with an example.

Saponification


Observe the figure and write the answers to the following questions.

  1. Write the name of the reaction shown in the following figure.
  2. Write the above chemical reaction in the form of a balanced equation.
  3. Write the name of the product produced in the above reaction, write a use.
  4. Write the name of the catalyst used in the above reaction.

Write the answers to the questions by observing the following figure.

  1. Write the chemical reaction shown in the figure above in the form of a balanced equation.
  2. Write the name of the gas coming out of the large test tube in the above chemical reaction.
  3. Why do small bubbles appear in the small test tube?
  4. What is the change in colour of lime water?

Give the balanced chemical equation of the following reaction:

Evolution of carbon dioxide by the action of ethanoic acid with NaHCO3.


The reaction between acetic acid and sodium carbonate is shown in the following figure.

Answer the questions with the help of a diagram.

  1. Which gas does come out as effervescence in the big test tube?
  2. What is the colour change in the lime water present in the small test tube?
  3. Write the related reaction.

Bubbles are seen in the test tube during the preparation of lime water.


Write an equation showing saponification.


Give the balanced chemical equation of the following reaction:

Neutralization of NaOH with ethanoic acid.


Give the balanced chemical equation of the following reaction:

Neutralization of NaOH with ethanoic acid.


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.


How is ethanol to ethanoic acid an oxidation reaction different from the reaction in which ethanol burns in the presence of oxygen?


Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.


Give the balanced chemical equation of the following reaction:

Combustion of ethanol.


Give the balanced chemical equation of the following reaction:

Neutralization of NaOH with ethanoic acid.


Give the balanced chemical equation of the following reaction:

Neutralization of NaOH with ethanoic acid.


Give the balanced chemical equation of the reaction.

Oxidation of ethanol by acidified potassium dichromate.


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