Question

Difficulty: MediumDetermining Author's Primary Purpose

In 1856, eighteen-year-old chemistry student William Henry Perkin set out to solve a pressing global problem: synthesizing quinine, the only known treatment for malaria, which had to be harvested expensively from the bark of South American cinchona trees. Working in a makeshift laboratory in his London home, Perkin attempted to produce the drug by oxidizing aniline, a coal tar derivative. Instead of the clear crystals of quinine he hoped for, his experiment yielded a dark, sticky residue at the bottom of his beaker.

Rather than discarding the failed mixture, Perkin investigated further. When he diluted the sludge with alcohol, he noticed it produced a vibrant, lightfast purple color. Recognizing the commercial potential of this accidental discovery, Perkin patented the substance as "mauveine," the world’s first synthetic dye. At the time, purple textiles were a luxury reserved for the ultra-wealthy because natural purple dye had to be painstakingly extracted from thousands of marine snails. Perkin’s synthetic dye made the coveted color widely accessible, sparking a fashion revolution. More importantly, his success laid the foundational framework for the modern petrochemical and pharmaceutical industries, demonstrating that valuable organic compounds could be artificially manufactured from industrial waste products like coal tar.

Which of the following best describes the primary purpose of the passage?

  1. A
    detail the specific chemical steps Perkin followed to oxidize aniline coal tar derivatives in his home laboratory
  2. B
    argue that synthetic manufacturing of organic compounds is inherently superior to harvesting resources from nature
  3. explain how a failed scientific experiment led to an accidental discovery that transformed both fashion and industrial chemistryAnswer
  4. D
    contrast the medical efficacy of natural quinine treatments with the visual appeal of synthetic mauveine dye

Answer

explain how a failed scientific experiment led to an accidental discovery that transformed both fashion and industrial chemistry
The correct answer is correct because the passage follows a chronological and cause-and-effect progression: starting with Perkin's failed attempt to synthesize a medicine (quinine), moving to his discovery of a purple compound, and concluding with the broad impacts of this substance (mauveine) on fashion and the birth of modern synthetic chemistry.

Step-by-Step Solution

1
Analyze the passage structure and identify the main subject.
The passage outlines how William Henry Perkin tried to create quinine but instead synthesized mauveine, the first synthetic dye, which influenced the fashion and chemical industries.
Tracking the overall progression of the text helps distinguish the primary purpose from secondary details.
2
Evaluate the choices to find the statement that encompasses the entire narrative arc.
The statement regarding the failed experiment leading to an accidental discovery that transformed fashion and industrial chemistry matches the passage's dual focus on the origin of mauveine and its historical consequences.
The correct answer must represent the global purpose of the whole text, not just one section.

Key Concept

Identifying the author's primary purpose by looking at the thesis, context, and structural development of a passage.
Estimated Time:1m 30s
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