" The number of structural isomers possible for an amine having the molecular formula "C_(3)H_(9)N" are "

The total number of structural isomers possible for an amine with molecular formula C_(4)H_(11)N is

The maximum number of structural isomers possible for the hydrocarbon having the molecular formula C_(4)H_(6) , is

The number of structural isomers possible from the molecular formula C_(3)H_(9)N is-