What is the relationship realized in the hydrocarbons?

275
The question is not quite right. The gas is not one link but many links. And they can be different. I would call the first three correct answer. In fact, the electronegativity of carbon and hydrogen are slightly different. Therefore, without large error, when in hydrocarbons can be considered nonpolar and polar, but definitely covalent.\r\n\r\prismotrim, for example, a molecule of ethane CH3-CH3. In this Central bond (between carbon atoms) is non-polar and-N - are very weakly polar.
127
Answer add

Other questions in the section - education

Pafnutiy
Severian
Aris
Veniamin
Burcov