Question

iupac name of both alkenes shown in image

Answer 1

i) Hexene


you can see it belongs to alkene group of saturated hydrocarbon,
It contains 6 carbon and 12 hydrogen, so there is a prefix of hex for 6 carbon and ene as prefix to show it's group,
this way it becomes

Hexene


ii) pentene

same thing should be done here you can see 5 carbon atoms with a double bond between those chains so, it becomes pent ene.