In the chemical compound c @h @, how many pairs of electrons are shared between the two carbon atoms?

In C2H2 three electron pairs are present between two carbon atoms. So three covalent bonds are present between two carbon atoms.
Explanation:
Carbon belongs to group 4th A of the periodic table. Each carbon atom contains four electrons in their valence shell. One electron is shared with hydrogen atom to form covalent bond while three electrons remain which combine with other carbon while sharing electrons. In this way three covalent bonds are formed between two carbon atoms.

Three pairs of electrons

Explanation:

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some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.