Because of this small difference in electronegativities, the C−H bond is generally regarded as being non-polar.
In October 2016, astronomers reported that the very basic chemical ingredients of life—the carbon–hydrogen molecule (CH, or methylidyne radical), the carbon–hydrogen positive ion (CH+) and the carbon ion (C+)—are created, in large part, using energy from the ultraviolet light of nearby stars, rather than in other ways, such as turbulent events related to supernovae and young stars, as thought earlier.
[3] The length of the carbonhydrogen bond varies slightly with the hybridisation of the carbon atom.
Unactivated C−H bonds are found in alkanes and are not adjacent to a heteroatom (O, N, Si, etc.).
[5] Although the C−H bond is one of the strongest, it varies over 30% in magnitude for fairly stable organic compounds, even in the absence of heteroatoms.