मराठी

Classification of Halogen Derivatives

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Estimated time: 7 minutes
Maharashtra State Board: Class 12

Key Points: Classification of Halogen Derivatives

1. On the Basis of Hydrocarbon Skeleton

Type General Formula Description
Haloalkanes R–X Halogen attached to an alkane
Haloalkenes R–CH=CHX Halogen attached to alkene
Haloalkynes R–C≡C–X Halogen attached to alkyne
Haloarenes Ar–X Halogen attached to aromatic ring

2. On the Basis of the Number of Halogen Atoms

Type Description
Monohalogen One halogen atom
Dihalogen Two halogen atoms
Trihalogen Three halogen atoms
Polyhalogen More than three halogens

3. On the Basis of the Nature of the C–X Bond

(A) Compounds containing sp³ C–X bond

Type Description Example
Alkyl halide Halogen attached to the sp³ carbon of the alkyl group R–CH₂–X
Allylic halide Halogen on carbon next to a double bond CH₂=CH–CH₂–X
Benzylic halide Halogen on carbon next to the benzene ring C₆H₅–CH₂–X

(B) Compounds containing a sp² C–X bond

Type Description Example
Vinylic halide Halogen directly on the double bond carbon CH₂=CH–X
Aryl halide Halogen directly on the aromatic ring Ar–X

4. Classification of Alkyl Halides

Type Structure Description
Primary (1°) R–CH₂–X Halogen attached to 1 carbon
Secondary (2°) R–CHX–R Halogen attached to 2 carbons
Tertiary (3°) R₃C–X Halogen attached to 3 carbons
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