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The electronic structure of the B C bond has been studied in 19 molecules using topological analysis of ELF. The boron–carbon bond has covalent-polarized character and is represented by disynaptic attractor V(B,C). Population (M062x) of the B C bond varies between 5.46e for the shortest bond and 1.22e for the longest bond. Analysis of the boron–carbon bond polarity (M062x) shows its formation mainly by the carbon atom. Topological analysis of electron localisation function (ELF) has been applied to study the nature of the B C, B C and B C bonds (1.278–1.645 Å) in 19 molecules using the DFT(M062x) method and 18 molecules using the CCSD method. The boron–carbon bond has a covalent-polarised character and is represented by the bonding disynaptic attractor and the basin, V(B,C). Population of the V(B,C) varies between 1.22 and 5.46e (M062x) or 1.93e and 5.45e (CCSD//CCSD(T)), respectively. The existence of single, double and triple BC bonds is confirmed by the topological results. [ABSTRACT FROM AUTHOR]