pBlock ElementsII - Result Question 2

####2. The number of pentagons in C60 and trigons (triangles) in white phosphorus, respectively, are (2019 Main, 10 April II)

(a) 20 and 3

(b) 12 and 4

(c) 20 and 4

(d) 12 and 3

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Solution:

  1. In C60 (Buckminster fullerene) twenty hexagons and twelve pentagons are present which are interlocked resulting a shape of soccer ball. Every ring in this structure is aromatic.

Phosphorus has large atomic size and less electronegativity, so it forms single bond instead of pπpπ multiple bond. So, it consists of discrete tetrahedral P4 molecule as shown below :

Number of trigons (triangles) =4



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