The number of pentagons in C60 and trigons (triangles) in white phosphorus, are:
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year Question
The number of pentagons in and trigons (triangles) in white phosphorus, are:
- a
12 and 3
- b
20 and 4
- c
20 and 3
- d✓
12 and 4
12 and 4
Strategy: Count the pentagons in C₆₀ and the trigons (triangles) in white phosphorus.
Step 1: Pentagons in C₆₀ (Buckminsterfullerene) is a truncated icosahedron with 20 hexagons and 12 pentagons. Number of pentagons = 12.
Step 2: Trigons (Triangles) in White Phosphorus White phosphorus exists as discrete molecules. Each molecule is a tetrahedron with 4 triangular faces. Number of trigons = 4.
Step 3: Final Answer Pentagons in = 12; Triangles in white phosphorus = 4.
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