The determination of the molecular structure of benzene, the prototypical aromatic compound, was an important milestone in the development of organic chemistry as a discipline. A variety of isomeric structures were proposed, some of which turned out to be real compounds distinct from benzene itself. Given the line structure for benzene below, select all line structures from the given set that represent isomers of benzene. Benzene Identify the circled functional groups in the given structure of L-Tyrosine, an amino acid that serves important functions in such diverse pathways as photosynthesis in plants and neurotransmission in humans. D B . C A NH2) H01 A: B: C: D: The species shown below is known as a sulfonium ylide, and appears as an intermediate in a pathway known as the Swern reaction that converts an alcohol to an aldehyde or ketone. All lone pairs are shown explicitly and all atoms have complete octets, but formal charges have been left off. Given the structure, we can conclude that carbon number [ Select ] should bear a formal charge of [ Select] while the sulfur atom should have a formal charge of [Select] 4 The curved arrow indicates the relationship between the given structure and a second [ Select ] form, with the true electronic structure of the molecule best understood as a hybrid of these two canonical forms. 3 :0 S: R- 1 2