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organic 1.pdf - In organic chemistry, an alkyne is an...

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In organic chemistry, an alkyne is an unsaturated hydrocarbon containing at least onecarbon—carbon triple bond. The simplest acyclic alkynes with only one triple bond and no otherfunctional groups form a homologous series with the general chemical formula. Alkynes aretraditionally known as acetylenes, although the name acetylene also refers specifically to knownformally as ethyne using IUPAC nomenclature. Like other hydrocarbons, alkynes are generallyhydrophobic. Structure and bonding In acetylene, the H–C≡C bond angles are 180°. By virtue ofthis bond angle, alkynes are rod-like. Correspondingly, cyclic alkynes are rare. Benzyne cannotbe isolated. The C≡C bond distance of 121 picometers is much shorter than the C C distance inalkenes or the C–C bond in alkanes. The triple bond is very strong with a bond strength of 839kJ/mol. The sigma bond contributes 369 kJ/mol, the first pi bond contributes 268 kJ/mol and thesecond pi-bond of 202 kJ/mol bond strength. Bonding usually discussed in the context ofmolecular orbital theory, which recognizes the triple bond as arising from overlap of s and porbitals. In the language of valence bond theory, the carbon atoms in an alkyne bond are sp
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Spring
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Tags
Pi Bond, Chemical bond, Alkyne, carbon triple bond

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