Alkenes have the general formula \(\ce{C_nH_{2n}},\) where \(n\) is the number of carbon atoms in the molecule. For example, if \(n=2,\) the alkene is called as ethene or also as ethylene with the formula \(\ce{C_2H_4};\) if \(n=3,\) the alkene would be called as propene or propylene with the formula \(\ce{C_3H_6}.\)

Alkanes are saturated hydrocarbons in which there is only a single bond between the Carbon atoms and Carbon and Hydrogen atoms. The general formula of an alkane is C n H 2 n + 2, where, n is the number of carbon atoms. A hydrocarbon in which two carbon atoms are bonded by a double bond is called alkenes.

2023年4月13日 · Alkenes and alkynes are two different classes of unsaturated hydrocarbons. An alkene has one or more carbon-carbon double bonds, while an alkyne has one or more carbon-carbon triple bonds. The fewest carbon atoms possible in either an alkene or alkyne is two.

2015年12月24日 · What are the general formulas for alkane, alkene, alkyne, alkyl, aldehyde, ketone, cycloalkane? A useful idea in this context is the degree of unsaturation, which I will outline with the answer. Alkanes: CnH 2n+2; Alkene: CnH 2n; Alkyne: CnH 2n−2; Alkyl residue: CnH 2n+1; Aldehyde/ketone: CnH 2nO; Cycloalkane: CnH 2n.

2023年7月12日 · The simplest alkyne—a hydrocarbon with carbon-to-carbon triple bond—has the molecular formula C 2 H 2 and is known by its common name—acetylene (Figure \(\PageIndex{1}\)). Its structure is H–C≡C–H.

Alkanes with general formula C n H 2n+2, alkenes with general formula C n H 2n and alkynes with general formula C n H 2n-2 form the most basic homologous series in organic chemistry. The successive members vary from each other by a CH 2 unit.

All alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes all have a formula of C n H 2n+2. The number of carbon atoms present in an alkane has no limit.

Alkanes are the simplest hydrocarbons we know of. They have the general formula of CnH2n+2. They belong to the saturated hydrocarbon family. They contain only sigma bonds between carbon and hydrogen.

Some representative alkenes—their names, structures, and physical properties—are given in Table 22.1a. In general, as the chain length increases, the melting and boiling points increase. In comparison to alkanes, alkenes have higher melting points but lower boiling points.

IUPAC nomenclature of alkanes, alkynes, and alkenes are explained below: Alkanes are the simplest hydrocarbons known to us. They have a general formula of C n H 2n+2. Alkanes belong to the family of saturated hydrocarbons that is; they contain only sigma bond linkages between carbon and hydrogen.