Nomenclature of alkene and alkyne : 
1-Define the parent chain: it is the largest chain on condition that it comprises unsaturated links and hence the compound 's primary name is based on its amount.etc when the complex unsaturated bonds are repeated.7-In the case of stereo composition (in English: stereoisomers) in machines (CIS or TRANS), the mark to be put before the mark must be engraved2-The unsaturated links must take the lowest number in the number when counting the parent chain, and write the position of the unsaturated connection in the mark.