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Ethanol

Ethanol is a simple alcohol with formula C2H5OH.

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Student-friendly explanation

How to write this in exams

1
Start with the exact idea
Ethanol is a simple alcohol with formula C₂H₅OH.
2
Then show how to use it
1. Write the structure or formula. 2. Identify the -OH group. 3. Classify the compound as an alcohol. 4. Recall its common uses and oxidation product.
3
Add one concrete example
CH₃CH₂OH is ethanol. It has two carbon atoms and one hydroxyl group at the end of the chain.
4
Avoid this incomplete answer
A common wrong answer is to call ethanol an acid because it contains oxygen. That is wrong because acidity depends on the -COOH group, not just oxygen.

Definition

Ethanol is a simple alcohol with formula C₂H₅OH.

Example

CH₃CH₂OH is ethanol. It has two carbon atoms and one hydroxyl group at the end of the chain.

Rule to remember

Ethanol has the formula C₂H₅OH. The key functional group is -OH. On oxidation, ethanol can form ethanoic acid under suitable conditions.

Memory hook

Ethanol means a two-carbon alcohol with -OH.

Examples and method

Worked example

When ethanol is oxidised gently, it can form ethanoic acid. This is a standard school-level example used to connect alcohols with acids.

Method to apply

1. Write the structure or formula. 2. Identify the -OH group. 3. Classify the compound as an alcohol. 4. Recall its common uses and oxidation product.

Diagram support

Show ethanol as CH3-CH2-OH so that the hydroxyl group is easy to identify.

How CBSE asks it

Questions may ask for the formula, the functional group, an oxidation product, or a use of ethanol.

Avoid common mistakes

Common confusion

Students often write ethanol only as C₂H₆O and forget to show the -OH group clearly.

Common wrong answer

A common wrong answer is to call ethanol an acid because it contains oxygen. That is wrong because acidity depends on the -COOH group, not just oxygen.

Exam tip

In answers, write both the formula and the functional group: C₂H₅OH, alcohol, -OH.

Quick check

Why is ethanol placed in the alcohol family?

Ethanol is placed in the alcohol family because it contains the hydroxyl group -OH. That group gives it the characteristic properties of alcohols.

Study the ethanol diagram carefully

Use the labelled diagram to keep ethanol clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of ethanol in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on ethanol.

Revision cue

Revise ethanol through the labels before writing the answer.

Answer writing and exam use

1-mark answer

Ethanol is a simple alcohol with formula C₂H₅OH.

2-mark answer

Ethanol is a simple alcohol with formula C₂H₅OH. Ethanol has the formula C₂H₅OH. The key functional group is -OH. On oxidation, ethanol can form ethanoic acid under suitable conditions. CH₃CH₂OH is ethanol. It has two carbon atoms and one hydroxyl group at the end of the chain.

3-mark answer

Ethanol is an important carbon compound because it contains the hydroxyl group -OH and belongs to the alcohol family. In the CBSE syllabus, students should know its structure, its use as a solvent and fuel, and its oxidation to ethanoic acid. It is a colourless liquid and mixes with water. Ethanol has the formula C₂H₅OH. The key functional group is -OH. On oxidation, ethanol can form ethanoic acid under suitable conditions. When ethanol is oxidised gently, it can form ethanoic acid. This is a standard school-level example used to connect alcohols with acids. Questions may ask for the formula, the functional group, an oxidation product, or a use of ethanol. A common wrong answer is to call ethanol an acid because it contains oxygen. That is wrong because acidity depends on the -COOH group, not just oxygen.

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