The $\mathrm{C}-\mathrm{C}$ bond length is maximum in

JEE Main · 2019 · 12 Apr 2019 · Shift 2 · p-Block Elements

The

C - C

bond length is maximum in

(A)graphite
(B) $C_{70}$
(C)diamond✓ Correct
(D) $C_{60}$

Answer: (C)

Solution

In diamond every carbon is

s p^{3}

with pure single

C - C

bonds about

154

pm long. Graphite (

s p^{2}

, roughly

142

pm) and the fullerenes

C X_{60}

and

C X_{70}

(around

140

–

145

pm) all carry partial double-bond character that shortens their bonds. So the longest

C - C

bond is in diamond.

JEE Main · 2019 · 12 Apr 2019 · Shift 2 · Single correct option

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