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Acetylene Structural Formula

The structural formula of the chemical compound is nothing but the graphicalrepresentation of its molecular structure and it also shows the arrangement of atoms within the molecules. The structural formula also shows the chemical bonding present within the molecule either as explicitly or implicitly. The three most common representations that areused in publications are, all Lewis type, condensed, and line-angle formula. The other formats that are used for the representation of structural formula in the chemical databases are such as CML and InChI.

Introduction to acetylene structural formula

Chemicalformula of acetylene (also known as ethyne) is HC2H. Each carbon atom can form four bonds and each hydrogen atom can form one bond so the atoms present in acetylene bond in the order of HCCH. They can be represented in acetylene structural formula as below. Each carbon atom has four electrons in their outer shell and each hydrogen atom has two electrons. Where each hydrogen atom forms a single bond with the carbon atom sharing two electrons which is represented by single line and a carbon atom forms triple bond with the other carbon atom sharing six electrons. The triple bond in the acetylene structural formula is represented with three lines.


Fig1: Acetylene structural formula

Properties of acetylene(structural formula)

Acetyleneis a colorless, flammable fuel gas with disagreeable odor which When burned with oxygen produces a hot flame, having a temperature of 5700°F to 6300°F.

  • IUPAC Name: acetylene
  • InChI format of acetylene structural formula: 1S/C2H2/c1-2/h1-2H
  • Canonical SMILES: C#C
  • Molecular Weight: 26.03728 [g/mol]
  • Molecular Formula: C2H2
  • Molar mass: 26.04 g mol−1
  • Density: 1.097 kg/m3
  • Melting point: −80.8 °C (189 K, subl)
  • Boiling point: −84 °C
  • Acidity (pKa): 25

Importance of structural formula of acetylene

  • It shows the arrangement of atoms within molecules

  • Shows the chemical bonding present within the molecule

  • Molecularformula of a compound does not provide much information to identify it but structural formulas provide the information needed. E.g. both ethanol and dimethyl ether have same molecular formula C2H6O but different structural formula.


Fig2:Ethanol and dimethyl ether structural formula