Alkyl Group Explained | Definition, General Formula & Examples — Chemistry Notes 2025

Understand what an alkyl group is in organic chemistry with its definition, general formula, types, and examples. These 2025 chemistry notes are perfect for IX, X, and XI students learning the basics of hydrocarbons.

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In this post, we’ll learn about the Alkyl Group, one of the most important concepts in organic chemistry. You’ll understand its definition, general formula (CnH₂n+1), types, formation from alkanes, and examples like methyl, ethyl, and propyl groups. These short and easy notes are perfect for students preparing for board exams 2025 and quick conceptual revision

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Quick Summary Section (for your blog body):

Definition:

An alkyl group is a group of atoms derived from an alkane by removing one hydrogen atom.

General Formula:

👉 CnH₂n+1

Examples:

• CH₃– (Methyl)

• C₂H₅– (Ethyl)

• C₃H₇– (Propyl)

• C₄H₉– (Butyl)

Types of Alkyl Groups:

• Primary (1°): Carbon attached to one other carbon

• Secondary (2°): Carbon attached to two other carbons

• Tertiary (3°): Carbon attached to three other carbons

Use:

Alkyl groups act as substituents in organic compounds like alcohols, halides, and alkanes.

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