Answer
The IUPAC name of the alkene is $4-vinylcyclohex-1-ene$
Work Step by Step
The compound has 6 carbon atoms in its longest carbon ring containing the double bond ($hex-$). It has a $vinyl-$ substituent at position 4, and a double bond at position 1. So, the IUPAC name of the alkene is $4-vinylcyclohex-1-ene$