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Module 6: Organic Chemistry and Analysis
6.1 Aromatic Compounds
6.1.1 Benzene structure
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Cards (29)
August Kekulé proposed that benzene has a cyclic structure with alternating single and double
bonds
What is unique about the carbon-carbon bond lengths in benzene?
All bond lengths are equal
Michael Faraday's discovery of
benzene
marked the initial identification of this organic compound.
True
Kekulé's model accurately explains benzene's resistance to addition reactions.
False
In benzene, all six carbon-carbon bonds are equal in
length
The unhybridized p orbitals in benzene form a delocalized
π electron
system.
True
What is the approximate length of each carbon-carbon bond in benzene?
1.39 Å
August Kekulé proposed that benzene has a cyclic structure with alternating single and double
bonds
Match the person with their discovery related to benzene:
Michael Faraday ↔️ Isolated benzene
August Kekulé ↔️ Proposed cyclic structure
In benzene, all six carbon-carbon bonds are equal in length, unlike
Kekulé's
prediction.
True
What is the major difference between Kekulé's model and the actual bond lengths in benzene?
Equal bond lengths
What type of hybridization does each carbon atom in benzene undergo?
sp² hybridization
What type of bonds are formed by the sp² hybrid orbitals in benzene?
σ bonds
The delocalized π electrons in benzene contribute to its high stability and resistance to
addition reactions
.
True
Match the compound with its stability and reactivity:
Benzene ↔️ High stability, low reactivity
Alkene ↔️ Low stability, high reactivity
Who was the first person to isolate benzene from illuminating gas?
Michael Faraday
Benzene readily undergoes addition reactions like alkenes.
False
Benzene is stable and resists addition
reactions
What fundamental concept about benzene did August Kekulé propose in 1865?
Cyclic structure with alternating bonds
What type of hybridization do carbon atoms undergo in benzene according to the modern understanding?
sp²
The delocalized π electron system in benzene makes it stable and resistant to addition
reactions
Who was the first to isolate benzene from illuminating gas?
Michael Faraday
Kekulé's cyclic structure of
benzene
laid the foundation for its modern understanding.
True
What type of reactions does benzene resist that alkenes undergo easily?
Addition reactions
Benzene resists addition reactions, whereas alkenes undergo them
easily
Benzene is cyclic with delocalized
π
electrons.
In benzene, the unhybridized p orbitals overlap to form a delocalized
π electron
system.
True
The delocalized π electron system in benzene ensures all carbon-carbon bonds have equal
lengths
.
What is the primary reason for benzene's stability?
Aromaticity