Multiple choice Which of the following organic compounds acts as a photoinitiator in polymer chemistry? Benzidine Benzil Benzilic acid Benzimidazole Reveal answer Fill a bubble to check yourself B Correct answer Explanation Benzil is the organic compound with the formula (C6H5CO)2, generally abbreviated (PhCO)2. This yellow solid is one of the most common diketones. Its main use is as a photoinitiator in polymer chemistry.