JEE Main201912 Apr 2019Evening ShiftChemistryp Block Elements (Group 13 & 14)Actual
The C - C bond length is maximum in:
Options
- AC 70
- BC 60
- Cgraphite
- Ddiamond
Correct answer
D. diamond
Step-by-step solution
In diamond, all carbons are s p 3 hybridised and hence bond lengths are similar to carbon-carbon single bonds. Graphite, C 70 and C 60 forms of carbon have delocalisation of electrons which leads to double bond characteristics. Hence, their bond lengths are in between carbon-carbon single and double bonds. Hence, diamond with only single bond character will be have the longest bond.