<P> Shorter than average C -- C bond distances are also possible : alkenes and alkynes have bond lengths of respectively 133 and 120 pm due to increased s - character of the sigma bond . In benzene all bonds have the same length : 139 pm . Carbon -- carbon single bonds increased s - character is also notable in the central bond of diacetylene ( 137 pm ) and that of a certain tetrahedrane dimer ( 144 pm ) . </P>
<P> Shorter than average C -- C bond distances are also possible : alkenes and alkynes have bond lengths of respectively 133 and 120 pm due to increased s - character of the sigma bond . In benzene all bonds have the same length : 139 pm . Carbon -- carbon single bonds increased s - character is also notable in the central bond of diacetylene ( 137 pm ) and that of a certain tetrahedrane dimer ( 144 pm ) . </P>
the carbon carbon bond length in benzene is
the carbon carbon bond length in benzene is
139 pm
139 pm