The number of pentagons in C₆₀ and trigons (triangles) in white phosphorus, respectively, are :

1. 12 and 3

2. 20 and 3

3. 20 and 4

4. 12 and 4

The C–C bond length is maximum in:

1. C₆₀

2. Diamond

3. Graphite

4. C₇₀

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite : 

C₆₀, an allotrope of carbon contains :

1. 16 hexagons and 16 pentagons.
2. 12 hexagons and 20 pentagons.
3. 18 hexagons and 14 pentagons.
4. 20 hexagons and 12 pentagons.