Alkanes – saturated hydrocarbons. The names The halogen is treated as a substituent on an alkane chain. Alkenes and Alkynes – unsaturated hydrocarbons. Organic: Nomenclature–Alkanes, Alkenes, & Alkynes.  . Other Actions. Embed Nomenclature: Alkanes, Alkenes, and Alkynes. basic IUPAC naming. The nomenclature for alkanes is based on To name an alkane, first identify the .

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Number the carbons of the parent chain from the end that gives the substituents the lowest numbers. Alkenes are named using the same general naming rules for alkanes, except that the suffix is now -ene. Light, electromagnetic radiation that can be detected by the human eye. A common method used by organic chemists to simplify the drawings of larger molecules is to use a skeletal structure also called a line-angle structure.

Alkanes, Cycloalkanes, Alkenes, Alkynes, and Aromatics – Chemistry LibreTexts

The position of the carbonyl group s on the parent nomenclwture is are indicated by placing the number s corresponding to the location s on the parent chain directly in front of the base name same as alkenes. Did you notice how there is no methene? Identify all of the substituents groups appending from the parent chain.

The Lewis structure for ethyne, a linear molecule, is: To name an alkane, first identify the longest chain of carbon atoms in its structure. Draw two other possible isomers in which the chlorine atom replaces a different hydrogen atom attached to the aromatic ring: Solution Each carbon atom is converted into the end of a line or the place where lines intersect. The parent structure is the longest chain containing both carbon atoms of the double bond.

Alkenes and Alkynes – unsaturated hydrocarbons Double bonds in hydrocarbons are indicated by replacing the suffix -ane with -ene. Please note that our editors may make some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed.


When compairing a series of numbers, the series that is the “lowest” is the one which contains the apkyne number at the occasion of the first difference. Internet URLs are the best.

Organic: Nomenclature–Alkanes, Alkenes, & Alkynes

Amines You are only expected alkwne know how to name amines by their common names. Benzene, C 6 H 6is the simplest member of a large alyne of hydrocarbons, called aromatic hydrocarbons. Examples include the dehydration of alcohols and the dehydrohalogenation loss of a hydrogen atom and a halogen atom of alkyl halides.

Alkene Reactivity and Naming. Ethers You are only expected to know how to name ethers by their commmon names. The position of the hydroxyl group s on the parent chain is are indicated by placing the number s corresponding to the location s on the parent chain directly in front of the base name same as alkenes.

Alkanes – saturated hydrocarbons The names of the straight chain saturated hydrocarbons for up to a 12 carbon chain are shown below. This leads to differences in geometries and in the hybridization of the carbon orbitals. There are a few common branched substituents which you should memorize. Solution The reactant is a five-carbon chain that contains a carbon-carbon double bond, so the base name will be pentene.

When both double bonds and hydroxyl groups are present, the -en suffix follows the parent chain directly and the -ol suffix follows the -en suffix notice that the e is left off, -en instead of -ene. The familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons.

The product of the halogenation reaction will have alkenne chlorine atoms attached to the carbon atoms that were a part of the carbon-carbon double bond:. IUPAC nomenclature of alkanes, alkynes, and alkenes are explained below:. The annual global production of ethylene averages around 75 million metric tons.

You may find it helpful to search within the site to see how similar or related subjects are covered. This condensed formula shows the unique bonding structure of benzene. Triple bonds are named in a similar way using the suffix -yne. If there are two or more different substituents they are listed in alphabetical order using the base name ignore the prefixes.


Alkenes Organic compounds that contain one or more double or triple bonds between carbon atoms are described as unsaturated. It is correct to also name this compound as 1-ethenylcyclohexene. Ethylene and acetylene are synonyms in the IUPAC nomenclature system for ethene and ethyne, respectively.

The position of alknae substituent or branch is identified by the number of the carbon atom it is bonded to in the chain. This compound contains 16 hydrogen atoms for a molecular formula of C 8 H Alkenes and alkynes, on the other hand, are unsaturated hydrocarbons.

In this example it is Echloroheptene.

Nomenclature of Alkanes, Alkenes and Alkynes – IUPAC Nomenclature

Detail discussion on Alkanes Physical Property. Endocyclic double bonds have both carbons in the ring and exocyclic double bonds have only one carbon as part of the ring.

The alkanes are saturated hydrocarbons—that is, hydrocarbons that contain only single bonds. If there is a choice in numbering not previously covered, the parent chain is numbered to give the substituents the lowest number at the first point of difference.

Stereoisomerism is therefore possible in those alkenes in which neither carbon atom bears two identical substituents. The Lewis structure for ethyne, a linear molecule, is:. The location of an alkyl group on a hydrocarbon chain is indicated in the same way as any other substituent:. There are a couple of unique ones like ethenyl’s common name is vinyl and 2-propenyl’s common name is allyl.