8 Questions
What does 'haem-' or 'hem-' mean?
Blood
Which medical condition is associated with an inherited tendency to bleeding?
Haemophilia
What does 'haemolysis' refer to in medical terms?
Destruction of red blood cells
What type of substitution is represented by the given reaction?
Electrophilic Aromatic Substitution (EAS)
What does the Kekulé structure suggest about the carbon-carbon bonds in benzene?
Alternating double and single bonds
Why can't the two forms (Kekulé structures) of benzene be separated?
Rapid equilibrium between the two forms
What is the nature of benzene's bonds according to the text?
"Combination" of alternating double and single bonds
Why are addition reactions difficult to occur in benzene?
"In a rapid equilibrium" making addition reactions hard to occur
Study Notes
Aromaticity and Aromatic Compounds
- Historically, compounds with pleasant odors, such as benzaldehyde and Eugenol, were considered aromatic because they contained a benzene ring.
- However, as chemists synthesized more compounds with benzene rings, they found that not all of them had a pleasant odor, such as benzoic acid and aspirin.
Benzene
- Benzene (also known as phene) is an organic compound with the formula C6H6.
- It was first isolated by Faraday in 1825.
- In 1845, Hofmann found benzene in coal-tar, which remains a source of benzene and its derivatives.
Reactions of Benzene
- Initially, scientists expected benzene to react like an unsaturated hydrocarbon, but experiments proved otherwise.
- Benzene does not react like an unsaturated hydrocarbon in addition reactions and oxidation reactions.
- Instead, benzene reacts in its own unique way, which is distinct from other unsaturated hydrocarbons.
Test your knowledge of medical terms with the prefix 'haem-', which relates to blood. Explore the meanings and applications of words like haematology, haemophilia, haemorrhage, and more.
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