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:
Halogen addition to them creates a mixture of a 1-2 and 1-4 addition product. One preparation of them involves butane undergoing thermal dehydration. Another synthesis of the conjugated variety of this chemical group involves elimination of unsaturated alcohols and alkyl halides. They include a number of useful reagents, including ones named for Chan, Dane, Brassard, Rawal, and Danishefsky. In addition to the conjugated variety, they also occur in isolated and cumulated varieties. Conjugation energy guarantees that the conjugated form is the most stable. For ten points, what is this organic functional group whose 1,3 variety are a principal reactant in the Diels-Alder reaction, and which is characterized by a pair of double bonds.
answer:
Science

question:
This man reformed the fyrd militia system so that it fought in shifts, allowing for the creation of a standing army without disrupting agriculture. In addition to establishing the burhs system of forts, this man built a secret military base on the swamp island of Athelney. This mans advisors included Bishop Asser, who wrote an early biography of him. This author of the so-called doom book won control of all territory west of Watling Street when he won the Battle of Edington against Guthrum the Old. Apart from translating many religious works into English, he is best known for ending the Danegeld. For ten points, name this King of Wessex, the only English monarch with the epithet the Great.
answer:
History

question:
One goddess of this place was a child of Zeus and Carme that invented hunting nets, and another figure from this place was mistakenly murdered by his son Althaemenes, fulfilling an oracle. In addition to Britomartis and Catreus, another figure from this place was cuckolded by the usurper Leucus and promised to sacrifice the first thing he saw on the beach when caught in a storm. One creature located in a city here had the alternate name (*) Asterius, while another creature circled this area thrice daily and protected Europa. The Curetes made lots of noise to drown out the sounds of infant Zeus, who was raised on Mt. Dicte in this area. Daedalus fashioned a bull costume for Pasiphae, the queen of this place, and eventually escaped from this island after fashioning wings. For 10 points, name this island home to king Minos, the Labyrinth, and the Minotaur.
answer:
Social Science