C60, an allotrope of carbon contains
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year Question
, an allotrope of carbon contains
- a
12 hexagons and 20 pentagons.
- b
16 hexagons and 16 pentagons.
- c
18 hexagons and 14 pentagons.
- d✓
20 hexagons and 12 pentagons.
20 hexagons and 12 pentagons.
Strategy: Recall the structural composition of Buckminsterfullerene, .
Step 1: Ring Composition (Buckyball) has the structure of a truncated icosahedron:
- 20 hexagonal (six-membered) rings
- 12 pentagonal (five-membered) rings
Step 2: Rule of Fullerene Structures All five-membered rings are surrounded only by six-membered rings (no two pentagons are adjacent — this is the isolated pentagon rule). Each carbon is hybridised with a delocalised system.
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