express which type of isomers

Alkynes and Alkadienes express which type of isomerism

CH_(3)-CH=CH_(2) and triangle express which type of isomerism

Alcohol and ehter express which type of isomerims

Select which complex have structural and stereo both type of isomers :

Write two isomers of molecular formula C_3H_8O . Which type of isomer is formed in this case? Give an example of organic polymer.