* C-C (Carbon-Carbon): This bond is very strong and relatively unreactive due to the similar electronegativity of carbon atoms.
* B-H (Boron-Hydrogen): This bond is relatively weak and polar, making it more reactive than C-C.
* C-O (Carbon-Oxygen): This bond is polar due to the difference in electronegativity between carbon and oxygen, leading to higher reactivity compared to C-C.
* O-H (Oxygen-Hydrogen): This bond is very polar due to the high electronegativity of oxygen. It is quite reactive, especially in acidic or basic conditions.
* H-Cl (Hydrogen-Chlorine): This bond is highly polar and very reactive due to the large difference in electronegativity between hydrogen and chlorine.
Therefore, the least reactive bond out of the options is the C-C (Carbon-Carbon) bond.
