So here we have six examples. So let's look at example A, in which we're going to name our alkane. So our first and second step tells us that we have to find the longest possible carbon backbone and we have to assign our double bond the lowest possible number value. So that means we have to begin on this end. So carbon number one, carbon number two, carbon number three, carbon number four. Notice in this case we have a four carbon backbone and our double bond has a one.