C6H5 - Phenyl

What is Phenyl?

Phenyl group is also referred to as aryl phenols, are compounds composed of a phenolic group connected directly to another aromatic ring. Any functional group containing an aromatic group, an aryl group is represented by Ar. Phenyl group is formed when a hydrogen atom is removed from the benzene ring. The phenyl group can then join to another atom or group of atoms. Aromatic phenyl group in the bridging polyene structures can improve thermo and photochemical stabilities of chromophores.

Other names – Phenyl radical

C6H5 Phenyl
Density 1.248 g/mL at 25 °C
Molecular Weight/ Molar Mass 77.106 g/mol
Boiling Point 232.2±7.0 °C at 760 mmHg
Melting Point −30 °C
Chemical Formula C6H5

Phenyl Structure – C6H5


Phenyl Structure

Physical Properties of Phenyl – C6H5

Odour Phenyl smell
Appearance White crystalline solid
Covalently-Bonded Unit 1
Heavy Atom Count 6
Complexity 27
Solubility Poorly soluble in water

Chemical Properties of Phenyl – C6H5

    • Phenyl group as phenol reacts with bromine solution forms bromo substituted phenol and hydrogen bromide. The chemical equation is given below.

2C6H5OH + 5Br2 → 2C6H2Br2OH + 6HBr

Uses of Phenyl – C6H5

  • Used today in combination with other phenolics in various institutional and domestic disinfectant formulations.
  • Used to destroy odour and promote sanitation.
  • Used in public places like schools, hotels, stores and offices as a disinfectant.
  • Possesses pharmacological properties and used as antioxidant, analgesics, choleretic, etc.

Frequently Asked Questions

What are phenyl groups made up of?

A cyclic group of atoms with formula C6H5 is a phenyl group or phenyl ring. Phenyl groups are closely related to benzene and can be described as a benzene ring, minus a hydrogen, which can be substituted as a functional group by any other element or compound. Phenyl groups have six carbon atoms in a hexagonal planar structure, of which five are bonded to hydrogen atoms.

Comment on the occurrence of phenyl groups in organic chemistry

Phenyl groups are present in many natural as well as synthetic organic compounds. Amino acid phenylalanine is the most popular among natural products, and it contains a group of phenyls. A big petrochemical industry product is the “BTX” consisting of benzene, toluene, and xylene, which are all building blocks for phenyl compounds.

Do phenyl groups readily undergo oxidation or reduction?

Phenyl groups tend to resist reduction as well as oxidation. Phenyl groups (similar to all other aromatic compounds) have relatively higher stability than aliphatic (non-aromatic) groups. This enhanced stability is due to the special properties of molecular orbitals in aromatic form.

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