Haloalkanes and Haloarenes Chapter 10 Class 12 NCERT Quiz

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Discuss the environmental impact of haloalkanes and haloarenes?

Haloalkanes and haloarenes are often persistent organic pollutants that can have detrimental effects on the environment, such as bioaccumulation and toxicity in aquatic organisms.

Explain the difference between haloalkanes and haloarenes?

Haloalkanes are alkanes with one or more hydrogen atoms replaced by halogen atoms, while haloarenes are aromatic compounds in which one or more hydrogen atoms in the benzene ring are replaced by halogen atoms.

Compare the reactivity of haloalkanes and haloarenes towards nucleophilic substitution?

Haloalkanes are more reactive towards nucleophilic substitution compared to haloarenes due to the difference in their molecular structure and the nature of the carbon-halogen bond.

In which type of compound do the halogen atoms directly bond to sp2 hybridized carbon atoms?

Haloarenes

Which functional group is present in both haloalkanes and haloarenes?

Alkyl halide

What is the general formula for haloalkanes and haloarenes?

$C_nH_{n+1}X$

What is the mechanism of the Finkelstein reaction?

The mechanism involves the substitution of a halide ion in a haloalkane with another halide ion from a different halogen, in the presence of a polar solvent.

How does the reactivity of haloalkanes and haloarenes differ in nucleophilic aromatic substitution?

Haloalkanes undergo nucleophilic substitution more readily than haloarenes due to the higher reactivity of alkyl halides compared to aryl halides.

Explain the concept of vicinal dihalides and give an example.

Vicinal dihalides are compounds with two halogen atoms attached to adjacent carbon atoms in a hydrocarbon chain. An example is 1,2-dibromoethane.

Study Notes

Haloalkanes and Haloarenes

Difference between Haloalkanes and Haloarenes

  • Haloalkanes: halogen atoms bonded to sp3 hybridized carbon atoms
  • Haloarenes: halogen atoms bonded to sp2 hybridized carbon atoms

Environmental Impact

  • Haloalkanes: ozone layer depletion, toxic and polluting effects
  • Haloarenes: toxic and carcinogenic effects

Reactivity towards Nucleophilic Substitution

  • Haloalkanes: more reactive due to sp3 hybridized carbon
  • Haloarenes: less reactive due to sp2 hybridized carbon

Functional Group

  • Haloalkanes and haloarenes both contain the halogen atom bonded to a carbon atom (R-X)

General Formula

  • Haloalkanes: R-X (R = alkyl group, X = halogen atom)
  • Haloarenes: Ar-X (Ar = aryl group, X = halogen atom)

Finkelstein Reaction

  • Mechanism: substitution of a halogen atom with a less reactive halogen atom (e.g., Cl- with I-)
  • Used to convert a chloride to an iodide

Nucleophilic Aromatic Substitution

  • Haloarenes: less reactive due to resonance stabilization of the aryl ring
  • Haloalkanes: more reactive due to the availability of the halogen atom for substitution

Vicinal Dihalides

  • Definition: compounds with two halogen atoms on adjacent carbon atoms
  • Example: 1,2-dichloroethane (CH₂ClCH₂Cl)

Test your understanding of Haloalkanes and Haloarenes with this quiz containing 10 short type questions and 10 brief type questions. Challenge yourself and assess your knowledge.

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