Question 283 marksShort AnswerSection C

Why is the conversion of ethanol to ethanoic acid an oxidation reaction? Name the oxidising agent used in this conversion. Write chemical equation for this oxidation reaction. How is this reaction different from the reaction in which ethanol burns in the presence of oxygen?

Carbon and its Compounds
Chemical Properties of Carbon Compounds

Official answer

1. Why the conversion is an Oxidation Reaction

The conversion of ethanol to ethanoic acid is an oxidation reaction because it involves the addition of oxygen and the removal of hydrogen from the ethanol molecule.


2. Oxidising Agent Used

The common oxidising agents used for this conversion are:

  • Alkaline potassium permanganate (alkaline KMnO4\mathrm{alkaline\ KMnO_4}) + Heat

OR

  • Acidified potassium dichromate (acidified K2Cr2O7\mathrm{acidified\ K_2Cr_2O_7}) + Heat

3. Chemical Equation

CH3−CH2−OH→or Acidified K2Cr2O7+HeatAlkaline KMnO4+HeatCH3−COOH\mathrm{CH_3-CH_2-OH \xrightarrow[or\ Acidified\ K_2Cr_2O_7 + Heat]{Alkaline\ KMnO_4 + Heat} CH_3-COOH}


4. Difference from Combustion of Ethanol

  • Controlled Oxidation: In this reaction, ethanol is selectively oxidized to ethanoic acid (a carboxylic acid) using chemical oxidising agents. The carbon-carbon backbone remains intact, and no carbon dioxide is formed.
  • Combustion: When ethanol burns in the presence of oxygen, it undergoes complete, uncontrolled oxidation to break down entirely into carbon dioxide, water, heat, and light:

C2H5OH+3O2→2CO2+3H2O+Heat and Light\mathrm{C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O + Heat\ and\ Light}

Answer keywords:addition of oxygenalkaline potassium permanganateacidified potassium dichromateethanoic acidcombustioncarbon dioxide and water

Marking scheme

  1. 1.Reason for being an oxidation reaction (addition of oxygen/removal of hydrogen) (0.5 marks)
  2. 2.Name of the oxidising agent (Alkaline KMnO4 or Acidified K2Cr2O7) (0.5 marks)
  3. 3.Correct chemical equation with reagents and heat specified on the arrow (1 mark)
  4. 4.Distinction between controlled oxidation (forming ethanoic acid) and combustion (forming CO2 and H2O) (1 mark)

Hint

Recall the definition of oxidation in terms of oxygen addition. For the difference, compare the final carbon-containing products of both reactions.

Quick oral answer

It is an oxidation reaction because oxygen is added to ethanol to form ethanoic acid. The oxidising agent is alkaline KMnO4 or acidified K2Cr2O7. Combustion yields carbon dioxide and water, whereas controlled oxidation yields ethanoic acid.

Common mistakes

  1. 1.Forgetting to write 'Heat' or the specific reaction conditions (alkaline/acidified) over the reaction arrow.
  2. 2.Confusing controlled chemical oxidation with complete combustion.

Analysis and explanation

Oxidation in organic chemistry can be controlled or complete. Alkaline KMnO4\mathrm{KMnO_4} or acidified K2Cr2O7\mathrm{K_2Cr_2O_7} are strong oxidising agents that supply nascent oxygen to convert the alcohol group (−CH2OH-\mathrm{CH_2OH}) into a carboxylic acid group (−COOH-\mathrm{COOH}). This is a controlled reaction. In contrast, combustion is an extreme, rapid, and uncontrolled oxidation process where all carbon atoms are fully oxidized to their highest oxidation state in the form of CO2\mathrm{CO_2}, releasing significant thermal energy.

Interesting facts

Alkaline potassium permanganate is purple in color. When added to ethanol, its purple color initially disappears as it oxidizes ethanol, but once the oxidation is complete, the purple color persists, acting as its own indicator!

Question details

Q28 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2024
Section
Section C
Marks
3
Type
Short Answer
Chapter
Carbon and its Compounds
Topic
Chemical Properties of Carbon Compounds
Bloom's level
Analyzing
Syllabus topic
Chemical properties of carbon compounds (combustion, oxidation)

Spotted a mistake or something unclear?

Tell us and we will fix it.

Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 3 marks in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Carbon and its Compounds" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Chemical Properties of Carbon Compounds" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a Short Answer question from Section C in the CBSE Class 10 Science 2024 paper.