(2E,4Z)-Hexa-2,4-diene reacts with ethene in a Diels-Alder reaction (assume it reacts). The product, 3,6-dimethylcyclohexene, is:

In the diene, one terminal methyl is on the outside and one on the inside of the s-cis form, so after cycloaddition the two methyl groups end up on opposite faces of the ring (trans). The trans isomer is $(3R,6R)$ or $(3S,6S)$, chiral and formed as a racemate. The cis isomer would be meso and would come from the (E,E) diene.