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Questions and Answers
What is the primary characteristic of alkanes at room temperature?
Which of the following best describes halogenation?
What type of reaction mechanism is employed in the halogenation of alkanes?
Under what conditions does the halogenation of alkanes occur?
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In the chlorination of methane, what is produced during the initiation step?
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Which halogen has the highest reactivity in the halogenation of alkanes?
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Study Notes
Alkanes and Reactivity
- Alkanes are generally unreactive and stable at room temperature.
- Alkanes are often called paraffins, which means lacking affinity for other substances.
Halogenation
- Halogenation is the replacement of one or more hydrogen atoms in an organic compound with a halogen (fluorine, chlorine, bromine, or iodine).
- The halogenation of an alkane is a free radical substitution reaction.
- A C-H bond is broken, and a new C-X bond is formed.
- This reaction only occurs in the presence of heat or UV light; no reaction takes place in the dark.
Halogenation Reaction
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RH + X2 ⭢ RX + HX
- RH: An alkane
- X2: Halogen (Cl2, Br2, etc.)
- RX: Alkyl halide
- HX: Hydrogen halide (HCl, HBr, etc.)
- X: Chlorine (Cl) or Bromine (Br)
Reactivity
- Cl2 is more reactive than Br2.
Chlorination of Methane
- Initiation: Cl2 → 2Cl (radicals created)
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Description
Explore the chemistry of alkanes and their reactivity through halogenation. This quiz focuses on the substitution reactions involving halogens and alkanes, highlighting mechanisms and the conditions necessary for these reactions to occur. Test your understanding of the stability of alkanes and the types of products formed in halogenation.
