The compound shown is 2-chlorobut-2-ene drawn with a definite geometry. Its configuration is

On C3 the groups are $\mathrm{CH}{}_3$ and $\mathrm{H}$; $\mathrm{CH}{}_3$ has priority. On C2 the groups are $\mathrm{Cl}$ and $\mathrm{CH}{}_3$; $\mathrm{Cl}$ (higher atomic number) has priority. In the drawing the C3 methyl and the chlorine are on opposite sides, so the compound shown is $(E)$. Note that the two methyl groups are on the same side (a cis-like arrangement), which is why cis/trans labels are unreliable for trisubstituted alkenes; the CIP label is $(E)$.