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a
It contains 20 six membered rings
b
It is aromatic
c
Two types of carbon -carbon bond lengths are observed
d
It is themodynamically most stable form of carbon
answer is D.
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Detailed Solution
It contains 20 six membered and 12 five membered rings.It is aromatic.Two types of carbon -carbon bond lengths (143.5 pm and 138.5 pm) are observed.All carbon atoms are sp2 hybridized.Themodynamic stability graphite>diamond>fullerene.It is the purest form of carbon.It is smooth with no dangling bonds.