Allylbromide on dehydrobromination gives? How do we know if it is propdiene or propylene?

Dear student,
Allyl bromide on dehydrobromination yields propdiene, since on dehydrobromination a double bond will be introduced which will convert the molecule into allene system or in other words propadiene.




Propylene has only one double bond hence not possible.

Hope it helps.,
Regards