I have doubts about dienes.
3,4-dimethylpenta-1,3-diene reacts with Cl2. The products are the 1,2 and the 1,4.
If I consider C1 and C2 as 1,2, I obtain a 1,2 product that is cinetic and thermodynamic product and a 1,4 produt that is less stable;
if I consider C3 and C4 as 1,2, I obtain a 1,2 product that is cinetic and thermodynamic product (but different and less stable that the one I obtained before) and the 1,4 product would not form.
I thought that Cl2 would attack the C1=C2 double bond first, because of the steric hindrance of the C3=C4, but I'm not sure.