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Published byRodger Gaines Modified over 5 years ago
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22nd June 2012 Alkynes AIM – to investigate the properties of alkynes
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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
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Preparation of ethyne Ethyne can be prepared from the reaction of calcium carbide and water
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Combustion Alkynes burn in oxygen with a smoky flame
Write a balanced equation for the complete combustion of ethyne 2C2H2 + 5O2 4CO2 + 2H2O
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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
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