In benzene:
A) all the carbon atoms are sp³ hybridized and the molecule has a planar structure
B) all the carbon atoms are sp² hybridized and the molecule has a planar structure
C) all the carbon atoms are sp hybridized
D) three carbon atoms are sp³ hybridized and three atoms are sp² hybridized
E) all the carbon atoms are sp² hybridized and the molecule has a chair or boat structure
IMAT 2025 · Question 43
Q43 - Aromatic hydrocarbons
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The correct answer is B) all the carbon atoms are sp² hybridized and the molecule has a planar structure.
Every carbon in benzene is sp², with 120° angles, so the molecule is flat. The leftover p orbitals on each carbon overlap above and below the ring to form the delocalised π system.
Chair and boat shapes (E) belong to cyclohexane, where the carbons are sp³.
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