Isomerism in alkenes by Gaetano Sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g en-us 2018-12-15 10:26:15 UTC 2025-04-05 19:55:49 UTC hello@padlet.com Isomerism in alkenes gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314878973 In alkenes we can find position isomerism, chain isomerism and geometric isomerism.]]> 2018-12-15 10:27:53 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314878973 Position isomerism in alkenes gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314879047 In alkenes with a carbon chain composed of 4 or more carbon atoms we can have position isomerism: in fact, the position of double bond can vary. When naming alkenes we have to specify the position of the double bond along the carbon chain using a number as prefix. This number indicates the position of the carbon involved in the double bond that came first in the order of the carbon chain.]]> 2018-12-15 10:29:14 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314879047 Chain isomers in Alkenes gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314879701 In alkenes we can find chain isomers because of the possibility to find alkenes with the same molecular formula but different lenght of the carbon chain. When naming alkenes we have to individuate the longest carbon chain and numerate it in order to give to the atoms involved in the double bond the smallest number possible. ]]> 2018-12-15 10:40:28 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314879701 Geometric isomers in Alkenes gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314880020 In alkenes there is not free rotation in the carbon atoms due to the presence of the double bond. When both the carbon atoms are linked to two atomic groups or atoms different from the hydrogen, we can have geometric isomerism. the two substinuents can be found in the same part relative to the double bond or in differents parts. 
In the first case tha name of the molecule is preceded by the prefix "cis-", in the second case by the prefix "trans-".
geometric isomers aren't spontaniusly interconvertible.]]> 2018-12-15 10:45:57 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314880020 Geometric isomers of dichloropentane gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314881137 2018-12-15 11:04:48 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/314881137 How to name geometric isomers gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315801621 2018-12-19 09:31:15 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315801621 Position isomers of butene gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315802817 2018-12-19 09:36:53 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315802817 Chain isomers with formula C4H8 gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315803083 2018-12-19 09:38:14 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315803083 Geometric isomers of dichloroethene gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315803811 2018-12-19 09:41:42 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315803811 All isomers of pentene gaetano_sangiuliano https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315805060 2018-12-19 09:47:49 UTC https://padlet.com/gaetano_sangiuliano/gwp3qi50uy2g/wish/315805060