Answer
The IUPAC name of the alkene is $2-ethylhex-1-ene$
Work Step by Step
The compound has 6 carbon atoms in its longest carbon chain containing the double bond ($hex-$). It has an $ethyl-$ substituent at position 2, and a double bond at position 1. So, the IUPAC name of the alkene is $2-ethylhex-1-ene$
