Highlight: Halogenoalkanes serve as versatile solvents due to their unique molecular structure, containing both polar and non-polar sections.

Example: CFCs undergo a chain reaction in the upper atmosphere: CCl₂F₂ → Cl° + CClF₂°, followed by Cl° reacting with ozone in a destructive cycle.

Definition: CFCs (chlorofluorocarbons) are compounds that were widely used as refrigerants but are now known to damage the ozone layer.

Vocabulary: Bond strength, measured in kJ mol⁻¹, varies significantly between different bonds $C-H: 413, C-Cl: 328, C-F: 485$, affecting their stability and reactivity.

Quote: "The use of halogenoalkanes is limited due to the environmental effects. Polychloroalkanes are toxic and CFCs damage the ozone layer, particularly over Arctic and Antarctic."

Definition: Halogenoalkanes are alkanes where one or more hydrogen atoms have been replaced by a halogen, resulting in at least one polar covalent bond.

Highlight: The hydrolysis reaction involves heating halogenoalkanes under reflux with sodium or potassium hydroxide solution, using water as a high-polarity solvent.

Vocabulary: Reflux refers to a process of continuous evaporation and condensation, utilizing a vertical condenser to prevent loss of volatile substances.

Example: During the silver nitrate test for halogenoalkanes, a substitution reaction produces halide ions, which then react with silver nitrate to form distinctive precipitates - white for chlorine, cream for bromine, and yellow for iodine.

Definition: Electronegativity decreases as halogen size increases, affecting bond strength and reaction rates in substitution reactions.