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.

[Q]: These compounds are described using the E-Z [E dash Z] notation when they occur across alkenes, and a more generalized version of that notation is the cis-trans notation. Both of those are examples of diastereomers [di-uh-stereo-mers], and examples of these include cyclohexane and hexene. Differing bonding patterns make up structural ones of these compounds. When these compounds are mirror images of each other, they are referred to as enantiomers [en-anti-omers]. For 10 points, name these compounds that have varying chemical structures despite having the same chemical formula.
[A]: Science

[Q]: A maximum independent set for this data structure can be found in linear time by adding alternating levels. In this structure, any two vertices or nodes must be connected by a single simple path, and thus it is connected and acyclic. By using (*) union-find with disjoint sets, one type of this structure containing all the vertices of a connected graph can be constructed. One variety of this data structure can be used to easily implement a binary search. This structure also comes in red-black and self-balancing-binary varieties. For 10 points, identify this data structure from computer science, a hierarchical graph in which "leaf" nodes ultimately flow from a "root" node.
[A]: Science

[Q]: In one of this author's plays, a visibly uncomfortable Athenian named Kinesias pleads to Myrrhine for relief, only for her to disappear into the Acropolis. This master of Old Comedy wrote a play in which two characters organize the construction of a city in the sky called Cloud-cuckoo-land. In another of his plays, a chorus of animals chant (*) ""Brekexexex koax koax"" and Dionysus goes to the underworld to judge a contest between Euripides and Aeschylus. For 10 points, name this ancient Greek playwright of Lysistrata, The Birds, and The Frogs.
[A]:
Literature