Number of alkynes possible with the formula, C₃H₄ is

Number of alkynes = 1 ;

Number of alkadienes (cumulative dienes) = 1 ;

Number of acyclic isomers = 2 ;

Number of cycloalkenes = 1 ;

Number of cyclic isomers = 1 ;

Number of acyclic structural isomers = 2 ;

Number of acyclic stereo isomers = 0 ;

Number of cyclic structural isomers = 1 ;

Number of cyclic stereo isomers = 0 ;

Total number of  structural isomers = 3 ;

Total number of  stereo isomers = 0 ;

Total number of isomers = 3 ;