Haloalkanes and haloalkanes

Topic Tree

1. Haloalkanes
   • Classification
   • Nature of C-X Bond
   • Preparation of Haloalkanes
   • Physical Properties
     • Solubility
     • Density
     • Melting and Boiling Points
   • Chemical Properties
     • Nucleophilic substitution reactions via SN1 and SN2 mechanism
     • Elimination reactions
     • Reaction with metals
     • Markovnikov’s rule
     • Peroxide effect
     • Saytzeff rule

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2. Haloarenes

• Classification
• Nature of C-X Bond
• Preparation of Haloarenes
• Physical Properties
  • Solubility
  • Density
  • Melting and Boiling Points
• Chemical Properties
  • Ortho and para-directing nature of haloarenes
  • Resonance stabilization at ortho and para positions
  • Dow’s process for preparation of phenol

3. Polyhalogen Compounds

• Examples
  • Dichloromethane
  • Chloroform
  • Iodoform
  • Carbon tetrachloride
  • Freons
  • DDT
• Uses and Environmental Impacts

Notes

Lecture Notes: Classification of Haloalkanes and Haloarenes

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Haloalkanes

Haloalkanes, also known as alkyl halides, are compounds containing a halogen atom (F, Cl, Br, or I) bonded to an sp³-hybridized carbon atom of an aliphatic chain.

Classification Based on the Number of Halogen Atoms

1. Mono-Haloalkanes: Contain one halogen atom (e.g., CH₃Cl, C₂H₅Br).
2. Di-Haloalkanes: Contain two halogen atoms (e.g., CH₂Cl₂, C₂H₄Cl₂).
3. Tri-Haloalkanes: Contain three halogen atoms (e.g., CHCl₃, CF₃CH₂Cl).
4. Poly-Haloalkanes: Contain more than three halogen atoms (e.g., CCl₄, CF₂Cl₂).

Classification Based on the Nature of the Carbon Atom Bonded to Halogen

1. Primary (1°) Haloalkanes: The carbon atom bonded to the halogen is attached to only one other carbon atom.
   Example: CH₃CH₂Cl (Ethyl chloride).
2. Secondary (2°) Haloalkanes: The carbon atom bonded to the halogen is attached to two other carbon atoms.
   Example: CH₃CHClCH₃ (Isopropyl chloride).
3. Tertiary (3°) Haloalkanes: The carbon atom bonded to the halogen is attached to three other carbon atoms.
   Example: (CH₃)₃CCl (Tert-butyl chloride).

Classification Based on the Type of Halogen

1. Fluoroalkanes: Contain fluorine (e.g., CH₃F).
2. Chloroalkanes: Contain chlorine (e.g., CH₃Cl).
3. Bromoalkanes: Contain bromine (e.g., CH₃Br).
4. Iodoalkanes: Contain iodine (e.g., CH₃I).

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Haloarenes

Haloarenes, also known as aryl halides, are compounds containing a halogen atom bonded to an sp²-hybridized carbon atom of an aromatic ring.

Classification Based on the Number of Halogen Atoms

1. Mono-Haloarenes: Contain one halogen atom (e.g., C₆H₅Cl, Chlorobenzene).
2. Di-Haloarenes: Contain two halogen atoms.
   • Ortho isomers: Halogens are on adjacent carbons (e.g., 1,2-dichlorobenzene).
   • Meta isomers: Halogens are separated by one carbon (e.g., 1,3-dichlorobenzene).
   • Para isomers: Halogens are opposite each other (e.g., 1,4-dichlorobenzene).
3. Tri-Haloarenes: Contain three halogen atoms (e.g., 1,2,4-trichlorobenzene).
4. Poly-Haloarenes: Contain more than three halogen atoms (e.g., Hexachlorobenzene).

Classification Based on the Position of Substituents

1. Ortho-Haloarenes: Halogen atom is at the 2nd position relative to another substituent.
   Example: o-Chlorotoluene.
2. Meta-Haloarenes: Halogen atom is at the 3rd position relative to another substituent.
   Example: m-Bromophenol.
3. Para-Haloarenes: Halogen atom is at the 4th position relative to another substituent.
   Example: p-Iodophenol.

Classification Based on the Type of Halogen

1. Fluoroarenes: Contain fluorine (e.g., C₆H₅F).
2. Chloroarenes: Contain chlorine (e.g., C₆H₅Cl).
3. Bromoarenes: Contain bromine (e.g., C₆H₅Br).
4. Iodoarenes: Contain iodine (e.g., C₆H₅I).

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These classifications form the basis for studying the structure, properties, and reactions of haloalkanes and haloarenes.

Activity

1. Quiz

Nature of C-X Bond

Activity: Quiz

Videos

Nucleophilic substitution reactions

Electrophilic substitution reactions of haloarenes

Worksheets

Unit Tests