instruction:
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
question:
One reactant for this reaction is best prepared by an S N 2 nucleophilic addition of a triphenyl compound, followed by elimination of the hydrogen halide by an organolithium reagent. This reaction itself proceeds through a rather unique intermediate formed when the pi electron from the reagents carbon-oxygen double bond migrates to the positively charged pole of one reactant; this intermediate is called a an oxaphosphetane, from which a triphenyl oxide is eliminated to complete the reaction. The aforementioned positively charged pole is on phosphorous because the aforementioned prepared reactant is a phosphorous ylide. For ten points, name this reaction that produces selectively double-bonded alkenes from aldehydes and phosphorous ylides and that is named for the German 1979 Chemistry Nobel winner.
answer:
Science

question:
This artist drew a god-figure flying near some clouds while Eve draws Adam's attention to the fruit in a tree in a painting of "The Earthly Paradise" in a series including "The Spies with the Grapes of the Promised Land;" that series is The Four Seasons. A man raises his red cloak with his left hand from atop a pedestal on the left of a painting by this artist who depicted a cherub blowing bubbles at the bottom left of a painting that also includes (*) Aurora leading Apollo's chariot in the sky near the ring of the zodiac; that painting features a winged old man on the right playing a lyre. This artist showed a woman in gold and blue placing her hand on the back of one of three shepherds at a tomb inscribed with the title phrase. For 10 points, name this painter of A Dance to the Music of Time and Et in Arcadia ego.
answer:
Fine Arts

question:
This river contains Csepel Island and Belene Island, and the city of Sulina lies at its mouth. This river receives the Naab and Regen in Regensburg, and its primary sources are the Breg and Brigach Rivers. The Devin Castle dominates the landscape of the area where this river receives the Morava. This river receives the Tisza and Sava Rivers, and in 2010(*) toxic sludge from Hungary contaminated its waters. Rising in the Black Forest, this is, for 10 points, what river that passes through Belgrade and Budapest before emptying into the Black Sea
answer:
Social Science