The number of single covalent bonds in C2H2 molecule are _____________ (HINT1: covalent bonds are formed by sharing of electrons; C -Valency = 4;H- Valency = 1)

To determine the number of single covalent bonds in a C2H2 molecule, we need to understand the structure of the molecule.

1. C2H2 is also known as acetylene. It is a hydrocarbon which consists of two carbon atoms and two hydrogen atoms.

2. The valency of carbon is 4, which means it can form 4 bonds. The valency of hydrogen is 1, which means it can form 1 bond.

3. In acetylene, each carbon atom is bonded to the other carbon atom with a triple bond (which counts as 3 bonds for each carbon atom).

4. Each carbon atom is also bonded to a hydrogen atom with a single bond.

5. Therefore, each carbon atom forms 4 bonds (3 with the other carbon atom and 1 with a hydrogen atom), and each hydrogen atom forms 1 bond (with a carbon atom).

6. So, in total, there are 2 single covalent bonds in a C2H2 molecule (each between a carbon and a hydrogen atom).