What Are Esters ? - Science

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What are esters ?

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Solution

Esters are sweet smelling substances. These are used in making perfumes and as flavouring agents.

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


Complete the following chemical equations:CH3COOC2H5+NaOH→


Complete the following chemical equations :CH3COOH + Na2CO3 →


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 ..................


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


What is the common name of ethanoic acid?

 

What is an oxidising agent? 


How is ethanoic acid obtained from ethanol? Write down the chemical equation of the reaction involved.


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


Which of the following molecular formula corresponds to ethylbutanoate ester?
(a) C5H10O2
(b) C6H12O2
(c) C7H14O2
(d) C8H16O2


Complete:

The next higher homologue of ethanoic acid is …………………


Acetic acid is a typical acid. Write one equation in case of its reactions with a base/alkali?


Name the reducing agent used to convert acetic acid into ethanol?


Explain the following term with example.

Reduction


Give the structural formula of Acetic acid.


Why is Soda lime used not only NaOH?


Name the first four members of alphatic carboxylic acid.


Write balanced euation for the following :

Write the equation for the preparation of ethylene from ethyl alcohol.


Write a fully balanced equation for the folowing case:

Acitic acid is warmed with ethanol in the presence of concentrated sulpheric acid.


State how the following conversions can be carried out:

Ethyl chloride to Ethene.


Write balanced chemical equation for the following :

 A mixture of sodalime and sodium acetate is heated


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 _____________.


With a labelled diagram describe in brief an activity to show the formation of ester.


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.


What are catalysts?


Give a chemical reaction in which a catalyst is used.


Write the characteristics of ethanoic acid.


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?

Ethanoic acid turns ______ litmus to ______


Give the balanced chemical equation of the following reaction:

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


Ethanoic acid is also known as which of these?


Ester is formed by the reaction between ______.


In the presence of the acid catalyst, ethanoic acid reacts with ethanol and ______ ester is produced.


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.

Ethanoic acid reacts with the basic salt, sodium carbonate, to form a salt, named ______, water and carbon dioxide gas.


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


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.


Observe the diagram given below and answer the questions:

  1. Name the reactants in this reaction.
  2. Which gas comes out as effervescence in the bigger test tube?
  3. What is the colour change in the lime water?
  4. In the above experiment instead of sodium carbonate which chemical can be used to get same products?
  5. Write the use of acetic 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:

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.


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