Why my teacher said that carbon can't form a quadriple covalent bonds with another carbon?

Question

Please answer in the term of the ability of carbon to bind with other organic elements to form organic compound....
in ethene, they form a double covalent bond. in ethyne they form a triple covalent bond... is it because if they form a quadriple covalent bond, they will have no extra electrons that they can't form an organic compound....
or is the formation of this bond simply need too much energy to be released in order to form bonds... or are there any other reasons for this?

Answer 1

The real answer lies in molecular orbital theory. But for a simplified answer think of the orbitals. In an sp-hybridized carbon (e.g. ethyne) , the sp bonds point towards and away from the carbon-carbon bond. That accounts for one of the C-C bonds as well as the 2 C-H bonds. The other two C-C bond come from the p orbitals, which are somewhat like rabbit ears--they overlap sideways, so the overlap is not as strong, but they do make bonds. The problem is the bonds that point away from the carbons--the ones that form the C-H bonds. To "bend" those electrons in requires energy, and it's very unstable. People have "made" C2 in the gas phase for very brief (tiny fractions of a second) intervals, but they're always happier in other forms and decompose.

Answer 2

Its a query of stability. A quad bond between 2 carbons can exist in basic terms quickly. Carbon can form compounds that appear as if a quad bond. i'm familiar with SiC, silicon carbide. This textile is used particularly in grinding and is a sturdy abrasive. the two Silicon and Carbon have 4 valence electrons, so it might seem a respected. quad bond. yet quite, plainly this compound is a covalent community shape, such as diamondds.