The molecular formula of tetracyanoethylene is C₆N₄, and the number of the sigma(σ) bonds present in a tetracyanoethylene is 9.
Sigma bond(σ) is defined as the strongest type of a chemical covalent bond. It is formed by overlapping of atomic orbitals and/or hybrid orbitals, which are present along the bond axis. For example, in methane molecule, there are 4 sigma(σ) bonds present in the form of C-H bonds. The structure of tetracyanoethylene is shown in the attached image.
In tetracyanoethylene, there are one sigma(σ) bond present in each C≡N. So there are total 4 sigma(σ) bonds. Carbon in the C≡N is attached by a single bond to the next carbon. Hence, there are total 4 sigma(σ) bonds. There is one sigma(σ) bond in C=C. If we add all these numbers, then total number of sigma bond is
4+4+1=9
Therefore, there are 9 sigma(σ) bonds present in tetracyanoethylene molecule.
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