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Magazine Chapter 11: Problem 42
Draw structural formulas for these haloalkanes. (a) Bromomethane (b) Chlorocyclohexane (c) 1,2 -Dibromoethane (d) 2 -Chloro-2-methylpropane (e) Dichlorodifluoromethane (Freon-12)
Short Answer
Expert verified
(a) CH3Br, (b) C6H11Cl, (c) CH2BrCH2Br, (d) (CH3)3CCl, (e) CCl2F2.
Step by step solution
01
Understanding the Haloalkane
Each name consists of two parts: the prefix indicates the halogen atom(s) attached to the carbon chain, and the root name indicates the number of carbon atoms in the longest chain or ring system.
02
Bromomethane
Bromomethane consists of one bromine atom attached to a methane molecule. Methane is a single carbon atom bonded to four hydrogen atoms. Replace one hydrogen with a bromine atom: \( \text{CH}_3\text{Br} \).
03
Chlorocyclohexane
Cyclohexane is a six-carbon ring with two hydrogen atoms on each carbon. Attach a chlorine atom to one of the carbon atoms in the ring: \( \text{C}_6\text{H}_{11}\text{Cl} \).
04
1,2-Dibromoethane
Ethane has two carbon atoms with single bonds and each carbon normally bonded to three hydrogens. Here, two bromine atoms are attached at the first and second carbons: \( \text{CH}_2\text{BrCH}_2\text{Br} \).
05
2-Chloro-2-methylpropane
Propane is a three-carbon chain. The '2-methyl' indicates a methyl group (\( \text{CH}_3 \)) is attached to the second carbon, and '2-chloro' means a chlorine atom is also attached to the second carbon: \( \text{(CH}_3\text{)}_3\text{CCl} \).
06
Dichlorodifluoromethane (Freon-12)
Methane contains one carbon bonded to four hydrogens. This compound has two hydrogen atoms replaced with chlorine atoms and two with fluorine atoms: \( \text{CCl}_2\text{F}_2 \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Structural Formulas
In organic chemistry, structural formulas are visual representations of molecules. They show not only the atomic composition but also how these atoms are connected to one another. When dealing with haloalkanes, we need to visualize where the halogen atoms (like bromine, chlorine, etc.) are placed relative to the carbon atoms. By doing so, structural formulas help in understanding the molecule鈥檚 shape and potential interactions. In drawing these structures:
- Count the total number of carbon atoms, which make up the backbone of the structure.
- Identify any functional groups, like halogens, that are substituting hydrogen atoms.
- Ensure that each carbon atom forms four bonds, as per the carbon's valency.
Organic Chemistry
Organic chemistry is the study of carbon-containing compounds and their properties, structures, and interactions. Haloalkanes, a subgroup in this branch, are organic compounds featuring one or more halogen atoms bonded to a carbon atom.
Chemists study these to understand reaction mechanisms, synthesis, and material properties. In organic chemistry:
Chemists study these to understand reaction mechanisms, synthesis, and material properties. In organic chemistry:
- Carbon atoms can form stable bonds with each other and other elements, creating complex structures.
- Haloalkanes exhibit various physical and chemical properties depending on their structure, such as polarity and boiling points.
- The nature of the halogen atoms influences the reactivity and potential applications of these compounds.
Halogenated Hydrocarbons
Halogenated hydrocarbons, or haloalkanes, are hydrocarbons in which one or more hydrogen atoms are replaced by halogen atoms. Common halogens in these compounds are fluorine, chlorine, bromine, and iodine.
The inclusion of halogens affects the physical and chemical properties of hydrocarbons:
The inclusion of halogens affects the physical and chemical properties of hydrocarbons:
- Polarity: The presence of halogen atoms generally increases the polarity of the molecule, impacting solubility and boiling points.
- Reactivity: Halogenated hydrocarbons can undergo a range of chemical reactions, such as nucleophilic substitution and elimination reactions.
- Applications: These compounds are used in a variety of fields, from refrigerants like Freon to solvents and as intermediates in chemical synthesis.
IUPAC Nomenclature
In chemistry, the IUPAC nomenclature system provides a standardized way to name chemical compounds, ensuring that scientists across the globe can communicate information unambiguously.
For haloalkanes:
For haloalkanes:
- The longest carbon chain is identified and named according to the number of carbon atoms it contains.
- The position of the halogen atoms is indicated with numbered prefixes, guiding the correct drawing and understanding of the molecule.
- Additional groups attached to the carbon chain, whether halogens or functional groups, are listed alphabetically as prefixes.
