Does the Textbook Answer Make Sense? 3 Carbons

[alingy1]

Does the answer from the textbook even make the slightest sense? How can there be three carbons?

 

[alingy1]

If it is C3H5F, there two missing. Why don't they put the two cases where fluorine is not connected to the double bonds?

 

[Qube]

Which textbook is this?

 

[Borek]

Definitely something is wrong with the question. Either "all" or only a subset, either of C₂XXX or C₃XXX.

 

[alingy1]

This is solomon's Organic Chemistry, edition 11. I think they meant C3H5F. If so, there is one isomer missing.