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Questions and Answers
What does 'haem-' or 'hem-' mean?
What does 'haem-' or 'hem-' mean?
- Heart
- Brain
- Lungs
- Blood (correct)
Which medical condition is associated with an inherited tendency to bleeding?
Which medical condition is associated with an inherited tendency to bleeding?
- Haematemesis
- Haemoptysis
- Haemophilia (correct)
- Haematuria
What does 'haemolysis' refer to in medical terms?
What does 'haemolysis' refer to in medical terms?
- Clotting of blood
- Destruction of red blood cells (correct)
- Formation of blood cells
- Transportation of blood
What type of substitution is represented by the given reaction?
What type of substitution is represented by the given reaction?
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What does the Kekulé structure suggest about the carbon-carbon bonds in benzene?
What does the Kekulé structure suggest about the carbon-carbon bonds in benzene?
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Why can't the two forms (Kekulé structures) of benzene be separated?
Why can't the two forms (Kekulé structures) of benzene be separated?
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What is the nature of benzene's bonds according to the text?
What is the nature of benzene's bonds according to the text?
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Why are addition reactions difficult to occur in benzene?
Why are addition reactions difficult to occur in benzene?
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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.
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