The number of electron pairs shared by the two carbon atoms which are bonded by a triple bond are.A Three B Four C Five D Six

The answer is A. Three.

Here's the step by step explanation:

1. A single bond is formed by the sharing of one pair of electrons between two atoms.
2. A double bond is formed by the sharing of two pairs of electrons between two atoms.
3. A triple bond, like the one between two carbon atoms in a molecule like acetylene (C2H2), is formed by the sharing of three pairs of electrons between the two carbon atoms.
4. Therefore, the number of electron pairs shared by the two carbon atoms which are bonded by a triple bond is three.