What is the name of this compound??
Since the longest chain is in a straight line, having 7 carbons and a double bond ;
So that's what it makes heptene since the double bond comes at the 2nd position , so it should be hept-2-ene .
Also, the ethyl group present at the 3rd position , so it should be;
3-ethyl-2-heptene or 3-ethylhept-2-ene ( to indicate that the double bond ''ene'' is present at the 2nd position ).
Hope this Helps.. ^_^