Which among the following is correct with respect to bond formation in an ethyne molecule?

Ethyne, also known as acetylene, is the simplest alkyne with the molecular formula C2H2 [1]. In this molecule, the two carbon atoms are linked by a triple bond (C≡C) to satisfy their tetravalency [1]. This triple bond consists of one sigma (σ) bond and two pi (π) bonds, resulting from the sp-hybridization of the carbon atoms. Each carbon atom also forms a single sigma bond with a hydrogen atom, creating a linear molecular geometry with a bond angle of 180°. Hydrocarbons containing one or more triple bonds are classified as alkynes, which are unsaturated and more reactive than saturated alkanes [1]. Therefore, the correct description of the bond formation between the carbon atoms in an ethyne molecule is a carbon-carbon triple bond.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > C—C Step 1 > p. 64