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ALKYNES. Alkynes are unsaturated hydrocarbons with atleast one tripple bond between carbon atoms. Members of this group of hydrocarbons conform to a formula of CnH2n-2. The first four members are ethyne,propyne,butyne and pentyne. NOMENCLATURE OF ALKYNES. Naming of alkynes is similar to that of alkanes and alkenes. They are named from their corresponding alkanes with same number of carbon atoms. In naming structures of alkynes,the longest continuous chain containing the tripple bond is identified and carbon atoms numbered from the side that will give the carbon atom with tripple bond the smallest number possible. For example,consider the structures of alkynes below. ISOMERISM IN ALKYNES. All unsaturated hydrocarbons exhibit both branching and positional isomerism. Naming them is similar to that alkenes. TEST OF ALKYNES. They decolourise oxidising like bromine water and potassium manganate (VII). ‌