What Is Oxidation in Carbon and Its Compounds Class 10: Definition & Examples

Definition of Oxidation in Carbon and Its Compounds

Oxidation in carbon and its compounds refers to a chemical process where the carbon atom either gains oxygen atoms or loses hydrogen atoms. In Class 10 Science, the NCERT textbook defines oxidation as:

• Gain of oxygen
• Loss of hydrogen

This process changes the oxidation state of carbon in the compound, leading to different chemical properties. For example, when ethanol ($C_2H_5OH$) is oxidised, it forms ethanoic acid ($CH_3COOH$) by gaining oxygen.

Key points:

• Oxidation increases the oxygen content in the molecule.
• It can also be seen as removal of hydrogen atoms.
• It is a common reaction in organic chemistry involving carbon compounds.

Types of Oxidation Reactions in Carbon Compounds

In carbon compounds, oxidation can occur in several ways:

1. Oxidation of Alcohols:

• Primary alcohols oxidise to aldehydes and then to carboxylic acids.
• Secondary alcohols oxidise to ketones.
• Tertiary alcohols generally do not oxidise easily.

2. Combustion:

• Complete combustion of carbon compounds produces carbon dioxide and water.

3. Addition of Oxygen:

• Oxygen atoms can add to carbon compounds, increasing their oxidation state.

Example:

• Ethanol ($C_2H_5OH$) oxidises to ethanal ($CH_3CHO$) and then to ethanoic acid ($CH_3COOH$).

This shows how oxidation changes the functional group and properties of carbon compounds.

Oxidation vs Reduction in Carbon Compounds: A Comparison

Understanding oxidation requires knowing its opposite, reduction. Here's a comparison:

This table helps Class 10 students clearly differentiate oxidation and reduction in carbon chemistry.

Worked Example: Oxidation of Ethanol to Ethanoic Acid

Let's see a step-by-step oxidation reaction:

Reaction:

$$C_2H_5OH + [O] \rightarrow CH_3CHO + H_2O$$ $$CH_3CHO + [O] \rightarrow CH_3COOH$$

• Ethanol ($C_2H_5OH$) first oxidises to ethanal ($CH_3CHO$), an aldehyde.
• Further oxidation converts ethanal into ethanoic acid ($CH_3COOH$).

Explanation:

• The symbol $[O]$ represents an oxidising agent.
• Oxygen is added to the carbon compound, increasing its oxidation state.

This example is important for Class 10 NCERT exams to understand oxidation in carbon compounds.

Importance of Oxidation in Everyday Life and Industry

Oxidation of carbon compounds is not just a textbook concept; it plays a vital role in daily life and industries:

• Respiration: Our body oxidises glucose to release energy.
• Combustion: Fuels like petrol and diesel oxidise to power vehicles.
• Food preservation: Oxidation causes food spoilage; antioxidants prevent it.
• Chemical synthesis: Industries use oxidation to produce acids, alcohols, and other chemicals.

Understanding oxidation helps Class 10 students appreciate the practical applications of carbon chemistry.

Common Oxidising Agents Used with Carbon Compounds

Several oxidising agents are used to oxidise carbon compounds in the lab and industry:

• Potassium permanganate ($KMnO_4$): Strong oxidiser used to convert alcohols to acids.
• Potassium dichromate ($K_2Cr_2O_7$): Used in acidic medium to oxidise primary and secondary alcohols.
• Oxygen ($O_2$): Used in combustion and respiration.

Example Reaction:

$$3C_2H_5OH + 2KMnO_4 + 4H_2SO_4 \rightarrow 3CH_3COOH + 2MnSO_4 + K_2SO_4 + 7H_2O$$

This reaction shows ethanol oxidised to ethanoic acid using potassium permanganate.