Chapter 17 of 22
Syllabus
Haloalkanes and Haloarenes — Syllabus
NEET-UG · Chemistry
Free Haloalkanes and Haloarenes syllabus for NEET-UG Chemistry 2026 — topics covered, weightage, and preparation priorities for this chapter.
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Topics covered in Haloalkanes and Haloarenes for NEET-UG Chemistry.
Topics in Haloalkanes and Haloarenes
1
Classification and Nomenclature
- Haloalkanes are classified as primary (1°), secondary (2°), or tertiary (3°) based on the carbon atom bearing halogen
- Common names use alkyl group name + halide (e.g., methyl chloride for CH₃Cl)
- IUPAC names use halogen as prefix + parent alkane (e.g., chloromethane for CH₃Cl)
2
Methods of Preparation of Haloalkanes
- From alcohols using hydrogen halides (HX) - follows SN1 or SN2 mechanism
- Using phosphorus halides (PCl₃, PCl₅, PBr₃, PI₃) - no rearrangement occurs
- Thionyl chloride (SOCl₂) method - gaseous byproducts make purification easy
3
Physical Properties
- Lower haloalkanes (CH₃Cl, CH₃Br, C₂H₅Cl) are gases at room temperature
- Higher members are colorless, sweet-smelling liquids
- Generally insoluble in water but soluble in organic solvents
4
Chemical Reactions - Nucleophilic Substitution
- SN1 mechanism: two-step process involving carbocation intermediate
- SN2 mechanism: one-step concerted process with backside attack
- SN1 favored by: tertiary halides, polar protic solvents, weak nucleophiles
Key Concepts
Haloalkanes are classified as primary (1°)From alcohols using HXSN1E1Low reactivity due to resonance stabilization
Frequently Asked Questions
What topics are covered in Haloalkanes and Haloarenes for NEET-UG?
Haloalkanes and Haloarenes is an important chapter in NEET-UG Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Classification and Nomenclature, Methods of Preparation of Haloalkanes, Physical Properties, Chemical Reactions - Nucleophilic Substitution.
How important is Haloalkanes and Haloarenes for NEET-UG?
Haloalkanes and Haloarenes is a frequently tested chapter in NEET-UG Chemistry. Questions from this chapter appear regularly in previous year papers. There are 68 practice questions available for this chapter.
How to prepare Haloalkanes and Haloarenes for NEET-UG?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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