Common Bond Lengths for Organic Functional Groups
| C-C | RC-CR | 154 (2) pm (=1.54 Å) . | C-F | 140 (2) |
| R3C-CR3 | 158 (3) | C(Aryl)-F | 136 (4) | |
| C-CH=C | 151 (2) | C-Cl | 179 (1) | |
| C=CH-CH=C | 146 | C(Aryl)-Cl | 174 (1) | |
| C-C[tripple]C, N | 145 (3) | C-Br | 197 (3) | |
| C[tripple]C-C[tripple]C | 138 | C(Aryl)-Br | 190 (1) | |
| RC-COOR, H | 148 (2) | C-I | 216 (2) | |
| C(Aryl)-I | 209 (3) | |||
| C=C | RC=CR | 132 (2) | C-S | 182 (2) |
| R=C=C=R | 128 | C=S | 170 (3) | |
| C=C delocalized aromatic | 138 (1) | C-P | 184 (3) | |
| C[tripple]C . | RC[tripple]CR | 118 (2) | C-Si | 188 (3) |
| C-O | C-O-R, H | 142 (1) | N-N | 145 |
| RC(O)-OR, H | 132 (2) | RN=NR | 126 (2) | |
| RCOO-R | 144 (2) | O-O | 147 (1) | |
| C(Aryl)-OR | 136 (2) | S-S | 205 | |
| C=O | C=O aldehyde, ketone | 122 (2) | N-P | 162 (2) |
| C=O carboxylate | 125 (2) | N-O | 133 (3) | |
| =C=O | 116 | S-O | 144 (1) | |
| C[tripple]O | RC[tripple]O | 115 (1) | NO2 | 122 (1) |
| C-N | RC-NR, H | 147 (1) | RP-OR | 159 (2) |
| RC(O)-NHR Peptide | 133 (1) | R2P=O | 148 (1) | |
| C=N | 134 (2) | R2S=O | 150 (1) | |
| C[tripple]N | 114 (1) | O=S(R2)=O . | 144 (2) | |
| N-,O-,C-H | 85-108 * | |||
| Os-/Ru-C | 222 (3) | Fe-C | 210 (4) | |
| Os-, Ru-P | 232 (4) | Fe-P | 221 (3) | |
| Os-Cl | 242 (2) | |||
* Bond lengths involving H-atoms can vary considerably due to electronic effects, H-bonds, etc.
Bond lengths in rings can vary, e.g. due to ring strain.