Understanding Michael Faraday's Discovery of Benzene

The question asks about the specific year when the English scientist Michael Faraday made the significant discovery of benzene. This discovery occurred while he was analyzing illuminating gas.

Michael Faraday was a renowned scientist who made numerous contributions to the fields of electromagnetism and electrochemistry. His work often involved studying various substances and their properties.

In the early 19th century, coal gas (used for illumination) was a common substance being studied. During his research, Faraday isolated and identified a new hydrocarbon from the oily residue left behind from this illuminating gas.

The Year of Benzene Discovery

Michael Faraday discovered benzene in the year 1825. He named this new compound "bicarburet of hydrogen". Later, the German chemist Eilhard Mitscherlich renamed it "benzene" in 1833 after synthesizing it from benzoic acid.

The discovery of benzene was crucial because it was one of the first aromatic compounds to be isolated and characterized. Its unique structure and properties paved the way for understanding a whole class of organic chemicals.

Analyzing the Options

Let's look at the given options:

• 1820: This is not the year Faraday discovered benzene.
• 1827: This is not the year Faraday discovered benzene.
• 1822: This is not the year Faraday discovered benzene.
• 1825: This is the year Michael Faraday discovered benzene in illuminating gas.

Based on historical records of Michael Faraday's work, the discovery of benzene from illuminating gas residues is specifically dated to 1825.

Conclusion: The Correct Discovery Year

The year in which Michael Faraday discovered benzene in illuminating gas was 1825.

Revision Table: Key Facts about Benzene Discovery

Additional Information: Michael Faraday and Benzene

Michael Faraday's work on benzene was just one of his many important discoveries. His analysis of the composition and properties of this new hydrocarbon was a significant step in the development of organic chemistry.

Illuminating gas, or coal gas, was produced by heating coal in the absence of air. It was primarily used for lighting in cities before the widespread adoption of electricity. The oily residue was a byproduct of this process.

Benzene's chemical formula is $\text{C}_6\text{H}_6$. It has a cyclic structure with alternating double and single bonds, which gives it its unique aromatic properties. This structure was later elucidated through the work of chemists like August Kekulé.