Sunday, January 27, 2008

IIT JEE Revision Alkynes Isomerism

Alkynes exhibit and chain isomerism and position isomerism

Chain isomerism
The arrangement of the chain is different in these isomers

Ex: Pent-1-yne Linear chain pentyne with triple bond at the terminal carbon.
3-Methylbut-1-yne - branched isomer having a methyl group at the 3rd carbon and triple at the terminal carbon.

Position isomerism - position of triple bond changes. Alkynes having more than four carbon atoms exhibit this isomerism.

1-Alkyne 2 Alkyne

Alkynes do not have geometrical isomerism as the bond angle is 180°

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