Haloalkanes and Haloarenes

This set of flashcards covers key concepts related to haloalkanes and haloarenes, including definitions, classifications, and significant applications in chemistry and environmental science.

What is formed when hydrogen atoms in hydrocarbons are replaced by halogen atoms?

Alkyl halide (haloalkane) for aliphatic hydrocarbons and aryl halide (haloarene) for aromatic hydrocarbons.

What is a haloalkane?

A haloalkane is a compound that contains a halogen atom attached to an sp3 hybridized carbon atom of an alkyl group.

What is a haloarene?

A haloarene is a compound that contains a halogen atom attached to an sp2 hybridized carbon atom of an aryl group.

What antibiotic is produced by microorganisms containing chlorine?

Chloramphenicol.

What hormone produced in the body contains iodine?

Thyroxine.

What disease is caused by a deficiency of thyroxine?

Goiter.

What is the classification of haloalkanes based on the number of halogen atoms?

They can be classified as mono, di, or polyhalogen compounds.

What is a primary alkyl halide?

An alkyl halide where the halogen is attached to a primary carbon atom.

What distinguishes vinylic halides?

Vinylic halides have halogen atoms bonded to an sp2 hybridized carbon atom of a carbon-carbon double bond (C=C).

What are benzylic halides?

Benzylic halides are compounds with a halogen atom bonded to a carbon atom that is attached to an aromatic ring.

What does the structure CnH2n+1X represent?

It represents the general formula for alkyl halides.

How are dihaloalkanes named in IUPAC nomenclature?

They are named as dihaloalkanes, with the prefix 'di-' indicating two halogens.

What is the relationship between electrophilic aromatic substitution and halogen directionality?

Halogen atoms are o, p-directing despite being slightly deactivating.

What reaction is used to prepare alkyl halides from alcohols?

Alcohols react with concentrated halogen acids, phosphorus halides, or thionyl chloride.

What are Grignard reagents?

Alkyl magnesium halides, RMgX, formed from alkyl halides and magnesium in dry ether.

What is the main product of the reaction of alkyl halides with KCN?

Alkyl cyanides.

What bonding characteristic makes haloarenes less reactive than haloalkanes?

The C—X bond in haloarenes has partial double bond character due to resonance.

What happens during nucleophilic substitution reactions in haloalkanes?

A nucleophile replaces the halogen atom, which acts as a leaving group.

What is the expected product when a haloalkane undergoes nucleophilic substitution?

An alcohol or an ether, depending on the nucleophile used.

What major factor influences the stability of a carbocation in SN1 reactions?

The stability of the carbocation increases with more alkyl groups attached.

What characterizes the SN2 mechanism?

The reaction rate depends on the concentration of both the substrate (haloalkane) and the nucleophile.

In which reaction can a mixture of products be expected due to the formation of a carbocation?

In SN1 reactions, a racemic mixture can form due to carbocation rearrangement.

What are polyhalogen compounds?

Compounds containing more than one halogen atom.

Name a common use of dichloromethane.

It's used as a solvent, a paint remover, and in the production of drugs.

What environmental issue is associated with the use of chlorofluorocarbons (CFCs)?

Depletion of the ozone layer.

What is the significance of DDT in agriculture?

DDT was widely used as an insecticide due to its effectiveness against vectors of diseases.