LIST - 1                                      LIST - 2

Compound                               C-C bond length

A) Benzene                               1) 1.42A°

B) Acetylene                             2) 1.54A°

C) Graphite                               3) 3.35A°

D) Diamond                              4) 1.20A°

                                                     5) 1.39A°

The correct match is

A  B  C  D

$\mathrm{C}-\mathrm{C}$  1.54A°

$\mathrm{C}=\mathrm{C}$  1.34A°

$\mathrm{C}\equiv \mathrm{C}$  1.20A°

Benzene

All C−C and C=C bond lengths are the same in benzene due to resonance. Hence, C−C bond length in benzene is 1.39A° (in the middle of C-C and C=C bond lengths)

Acetylene (Ethyne)

                           $\mathrm{CH}\equiv \mathrm{CH}$

So, bond length of $\mathrm{C}\equiv \mathrm{C}$  is 1.20A°

Graphite

Graphite has both C−C and C=C bonds and bond length of C=C in graphite is 1.42A°

Diamond

Diamond only has C-C single bonds thus the bond length is 1.54A°