Organic Chemistry Class-10 Goyal Brothers ICSE Solutions Ch-11

CH3COOH + C2H5OH     —–conc. H2SO4—–>  

Answer :

CH3COOH + C2H5OH     —–conc. H2SO4—–>  CH3COOC2H5 +H2O

ii) C2H5OH———-Conc.H2SO4————–>CH2=CH2  + H2O
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Question 4. Give the IUPAC name of CH3COOH.
Answer : Ethenoic Acid

Question 5. An organic compound A has a molecular formula C2H402 and is acidic in nature. On heating with ethyl alcohol and conc. sulphuric acid, vapours with pleasant fruity smell are given out. What is the compound A and what is the chemical equation involved in this reaction?
Answer :

The compound ‘A’ with molecular formula C2H4O2 is ethanoic acid (acetic acid). Upon heating with ethanol (ethyl alcohol) and concentrated sulphuric acid, ethyl ethanoate (ethyl acetate) is formed as the product. It is an ester with pleasant or fruity smell. The reaction is known as esterification reaction

CH3COOH (ethanoic acid (acetic acid) + C2H5OH ethanol (ethyl alcohol) —→ CH3COOC2H5 (ethyl ethanoate (ethyl acetate) + H2O

Question 6.  Fill in the blank space with a suitable word:

The organic acid present in vinegar is  ……….  .
Answer :

The organic acid present in vinegar is  …acetic acid……

Question 7. An organic compound A has a molecular formula C2H6O. On oxidation in air in the presence of heated copper as catalyst, it is oxidised to CH3COOH. What is compound A? Give the equation for the reaction.

Answer :

The compound A’ on oxidation gives acetic acid, CH3COOH. Now, acid is obtained by the oxidation of an alcohol or an aldehyde, so compound A should be an alcohol (ethyl alcohol) or an acetaldehyde because its molecule contains two carbon atoms. Ethyl alcohol is CH3CH2OH or C2H6O and acetaldehyde is CH3CHO or C2H4O

CH3CH2OH ——— CH3COOH.

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Question 8. Write the chemical formulae of ethanoic acid and methanal.

Answer :

the chemical formulae of ethanoic acid is –CH3COOH

Write the chemical formulae of methanal.–HCHO

Question 9. Write two tests to demonstrate that acetic acid (CH3COOH) is acidic in nature.

Answer :

Test to show that CH3COOH is acidic are :

  1.  When litmus test is done, it turns blue litmus red.
  2.  It react with bases to form salt and water.

Question 10. White the name and structural formula of the simplest organic acid.

Answer : Simplest organic acid is Formic acid and the chemical formula is HCOOH

Question 11.  What do you understand by the term decarboxylation?

Answer :Decarboxylation is a chemical reaction that removes a carboxyl group and releases carbon dioxide (CO2). Usually, decarboxylation refers to a reaction of carboxylic acids, removing a carbon atom from a carbon chain.

Question 12. How will you convert ethanoic acid to methane?

Answer :Ethanoic acid can be coverted to methane by  decarboxylation i.e. ethanoic acid on reaction with NaOH gives sodium acetate, which on evaporation and heating leads to decarboxylation giving methane


 Objective Type Questions

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Organic Chemistry Class-10 Goyal Brothers ICSE Solutions Ch-11

 I. Multiple Choice Questions

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II. Fill in the blanks spaces with the choice given in brackets:

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III Choose from the following list, as what matches the descriptions given below :

[Isomers, ethene, esterification, diastase, zymase, ethyne, calcium carbide, ethanol, hydrogen, ethene glycol] 1. An organic compound with -CHO group.
2. Onganic compounds which has same molecular formula, but different structural formulac.
3. An inonganic compound used in the preparation of acetylene gas.
4. A gas commonly used for ripening raw fruits
5 Agas which forms reddish precipitate when passed through ammoniacal cuprous chloride
6. Arcaction between alcohol and acetic acid in the presence of conc. sulphurc acid.
7. An enzyme which breaks dowm starch into maltose.
&. An eymes which converts glucose into alcohol.
9. The product formed when ethene gas is passed through 1% alkaline potassium permmanganate solution.
10. A gas liberated when ethanol is treated with sodium at room temperature.

–: End of Organic Chemistry Class-10 Goyal Brothers :–


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