The number of possible alkynes with molecular

The number of isomers possible with molecular formula C_(2)H_(4)Cl_(2) is :

the number of alkynes possible with molecular formula C_(5)H_(8) is :

The number of possible alkynes (strucutral only) for the compound having molecular formula C_(3)FCIBrL is:

The number of possible alkynes (strucutral only) for the compound having molecular formula C_(3)FCIBrI is: