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I know the IUPAC name, but what are Z and E?

12.  The IUPAC name of the following compounds is :
(1)  (Z)  -  5  hepten  -  3  -  yne
(2)  (Z)  -  2  hepten  - 4  -  yne
(3)  (E)  -  5  hepten  -  3  -  yne
(4)  (E)  - 2  hepten  -  4  -  yne
 

E and Z are type of nomenclature same as cis -trans n priority is given to the group on the basis of their atomic masses.
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As in this case 1priority is given to the group which have more atomic mass in both LHS n RHS side and in LHSand RHS 1 priority of both is in opposite to each other so we consider it as E nomenclature if there is any case in which 1priority group in same side both in LHS n RHS then that will be considered as Z nomenclature.

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