22nd June 2012 Alkynes AIM – to investigate the properties of alkynes.

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Presentation transcript:

22nd June 2012 Alkynes AIM – to investigate the properties of alkynes

Alkynes contain a triple carbon - carbon bond They have the general formula CnH2n-2 They have the name suffix –yne with a number to indicate the position of the triple bond in the chain if necessary For this course we only need to consider reactions of ethyne

Preparation of ethyne Ethyne can be prepared from the reaction of calcium carbide and water

Combustion Alkynes burn in oxygen with a smoky flame Write a balanced equation for the complete combustion of ethyne 2C2H2 + 5O2 4CO2 + 2H2O

Addition Alkynes will be converted to haloalkenes by the addition of halogens or HCl Alkynes will be converted to alkenes by the addition of hydrogen