Alkyne A hydrocarbon containing

Alkyne A hydrocarbon compound containing one or more triple bonds. 

An alkyne is a hydrocarbon containing a carbon-carbon triple bond. The general formula is CkH2 2-... 

Give the molecular formula of a hydrocarbon containing five carbon atoms that is (a) an alkane, (b) a cycloalkane, (c) an alkene, (d) an alkyne. Which are saturated and which are unsaturated hydrocarbons ... 

Alkyne al- kln [alkfl+-yne, alter, of -me] (ca. 1909) n. C H2 2- A hydrocarbon containing at least one pair of carbon atoms linked by a triple bond (-C=C-). The simplest alkyne is acetylene, HC=CH. adj. Signifying the presence in a compound of the triple bond. 

A hydrocarbon containing one or more carbon-carbon double or triple bonds. The three most important classes of unsaturated hydrocarbons are alkenes, alkynes, and arenes. 

In lUPAC nomenclature, a hydrocarbon containing both double and triple bonds is called an alkenyne. The chain is numbered starting from the end closest to either of the functional groups. When a double bond and a triple bond are at equidistant positions fiom either terminus, the double bond is given the lower number. Alkynes incorporating the hydroxy function are named alkynols. Note the omission of the final e of -ene in -enyne and of -yne in -ynol. The OH group takes precedence over both double and triple bonds in the numbering of a chain. 

Alkynes are hydrocarbons that contain a carbon-carbon triple bond Sim pie alkynes having no other functional groups or rings have the general formula C H2 -2 Acetylene is the simplest alkyne... 

Try making a model of a hydrocarbon that contains three carbons only one of which is sp hybridized What is its molecular formula Is it an alkyne" What must be the hybridization state of the other two carbons (You will learn more about compounds of this type in Chapter 10 )... 

An alkyne is a hydrocarbon that contains a carbon-carbon triple bond. Acetylene.. H—C= C—H, the simplest alkyne, was once widely used in industry as the starting material for the preparation of acetaldehyde, acetic acid, vinyl chloride, and other high-volume chemicals, but more efficient routes to these substances using ethylene as starting material are now available. Acetylene is still used in the preparation of acrylic polymers but is probably best known as the gas burned in high-temperature oxy-acetylene welding torches. 

An alkyne is a hydrocarbon that contains a carbon-carbon triple bond. Alkyne carbon atoms are sp-hybridized, and the triple bond consists of one sp-sp a bond and two p-p tt bonds. There are relatively few general methods of alkyne synthesis. Two good ones are the alkylation of an acetylide anion with a primary-alkyl halide and the twofold elimination of HX from a vicinal dihalide. 

Alkyne (Chapter 8 introduction) A hydrocarbon that contains a carbon-carbon triple bond, RC CR. 

Scientists classify hydrocarbons as either aliphatic or aromatic. An aliphatic hydrocarbon contains carbon atoms that are bonded in one or more chains and rings. The carbon atoms have single, double, or triple bonds. Aliphatic hydrocarbons include straight chain and cyclic alkanes, alkenes, and alkynes. An aromatic hydrocarbon is a hydrocarbon based on the aromatic benzene group. You will encouter this group later in the section. Benzene is the simplest aromatic compound. Its bonding arrangement results in special molecular stability. 

A hydrocarbon is a compound that consists only of carbon and hydrogen atoms. Each contains a skeleton of carbon atoms bonded to varying numbers of hydrogen atoms. Hydrocarbons include alkanes, alkenes, alkynes, and aromatic hydrocarbons. 

Alkynes are hydrocarbons that contain a carbon-carbon triple bond. A triple bond consists of a cr bond and two tt bonds. The general formula for the alkynes is C li2n-2- The triple bond possesses two elements of unsaturation. Alkynes are commonly named as substituted acetylenes. Compounds with triple bonds at the end of a molecule are called terminal alkynes. Terminal —CH groups are called acetylenic hydrogens. If the triple bond has two alkyl groups on both sides, it is called an internal alkyne. 

The above discussions have concentrated on hydrocarbons, both saturated and unsaturated, with the unsaturated hydrocarbons containing only one multiple bond. The unsaturated hydrocarbons are the alkenes with one double bond and the alkynes with one triple bond. There are other straight-chain hydrocarbons that are unsaturated containing more than one multiple bond, some with more than one double bond, and some with a mixture of double bonds and triple bonds. The combinations and permutations are endless, but there are only a few of the highly unstable materials. 

Carbon can also form multiple bonds with other carbon atoms. This results in unsaturated hydrocarbons such as olefins (alkenes, C H2 ), specifically, hydrocarbons containing a carbon-carbon double bond or acetylenes (alkynes, C H 2) containing a carbon-carbon triple bond. Dienes and polyenes contain two or more unsaturated bonds. 

As noted in Sect. 4.1, in the hydrogenation of diunsaturated hydrocarbons it is generally observed that both the corresponding monoolefin and alkane are formed in the initial stages of the reaction, the former product generally predominating. Further, in the reactions of alkynes and diolefins containing more than three carbon atoms, a distribution of isomeric olefins is usually observed. 

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