Will 2,3-dimethyl-1,3-butadiene and 2-cyclohexene-1,4-dione have a concerted reaction in the presence of UV light?

• A. There will be a concerted reaction in the presence of UV light.
• B. No concerted reaction will take place in the presence of UV light.
• C. 2,3-dimethyl-1,3-butadiene will only react with itself in the presence of UV light.
• D. 2,3-dimethyl-1,3-butadiene and 2-cyclohexene-1,4-dione will only react in the presence of heat.

Answer: (A)