The INCORRECT statement regarding the structure of $\mathrm{C}_{60}$ is:

(D) It contains 12 six-membered rings and 24 five- membered rings.

(A) Each carbon atom forms three sigma bonds.

(B) The five- membered rings are fused only to six-membered rings.

(C) The six-membered rings are fused to both six and five-memebered rings.

JEE Main · 2021 · 16 Mar 2021 · Shift 2 · p-Block Elements

The INCORRECT statement regarding the structure of

C_{60}

is:

(A)Each carbon atom forms three sigma bonds.
(B)The five- membered rings are fused only to six-membered rings.
(C)The six-membered rings are fused to both six and five-memebered rings.
(D)It contains 12 six-membered rings and 24 five- membered rings.✓ Correct

Answer: (D)

Solution

Buckminsterfullerene is a closed cage of sixty carbon atoms, each

s p^{2}

hybridised and joined to three neighbours by sigma bonds, the fourth electron going into the delocalised

π

system. The cage is built from twenty six-membered rings and twelve five-membered rings; each five-membered ring is surrounded entirely by six-membered rings, while a six-membered ring shares edges with rings of both sizes. The ring count of twelve six-membered and twenty-four five-membered rings is the statement that is wrong.

JEE Main · 2021 · 16 Mar 2021 · Shift 2 · Single correct option

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JEE Main · 2021 · 16 Mar 2021 · Shift 2 · p-Block Elements

Solution

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