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Which of the following substances is not an aromatic compound?

Which of the following substances is not an aromatic compound? Correct Answer Hexene

The correct answer is Hexene.

Key Points

Explanation:

  • In chemistry, aromaticity is a property of cyclic, planar structures with a ring of resonance bonds that gives increased stability compared to other geometric or connective arrangements with the same set of atoms.
  • These molecules are very stable and do not break apart quickly to react with other substances.
  • 1-Hexene is an organic compound with the formula C₆H₁₂. It is not an aromatic compound.
  • It is an alkene that is classified in industry as higher olefin and an alpha-olefin, the latter term meaning that the double bond is located at the alpha position, endowing the compound with higher reactivity and thus useful chemical properties. 
    • Formula- C6H12
    • Boiling point- 63.85 °C
    • Density- 673 kg/m³
  • Benzene is an aromatic compound, as the C-C bonds formed in the ring are not exactly single or double, rather they are of intermediate length.
    • Aromatic compounds are divided into two categories: benzenoids (one containing benzene ring) and non-benzenoids (those not containing benzene ring), provided they follow Huckel rule.
  • Naphthalene is an organic compound with formula C₁₀H₈. It is the simplest polycyclic aromatic hydrocarbon and is a white crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass. 
    • Formula- C10H8
    • Melting point- 80.26 °C
    • Boiling point- 218 °C
    • Density- 1.14 g/cm³
    • Classification- Hydrocarbon, Polycyclic aromatic hydrocarbon, Organic compound
  • Anthracene is a solid polycyclic aromatic hydrocarbon of formula C₁₄H₁₀, it consists of 3 fused benzene rings.
    • It is a component of coal tar. It is used in the production of the red dye alizarin and other dyes.
    • Anthracene is colorless but exhibits a blue fluorescence under ultraviolet radiation.
      • Formula- C14H10
      • Boiling point- 340 °C
      • Density- 1.25 g/cm³
      • Classifications- Polycyclic aromatic hydrocarbon

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