6 public questions tagged with this topic.
In sunlight, Cl₂ adds to benzene via free radical mechanism, forming C₆H₆Cl₆ (hexachlorocyclohexane).
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Classification and Nomenclature and Isomerism of Haloalkanes
Moles of benzene = (39/78) = 0.5 mol . Moles of toluene = (92/92) = 1 mol . Total moles = 0.5 + 1 = 1.5 . Mole fraction = (0.5/1.5) ≈ 0.333 .
Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Abnormal Molar Masses and van't Hoff Factor
Benzene has a planar hexagonal ring with sp2 hybridized carbons, resulting in bond angles of 120°.
Ref: NCERT Class 11 Chemistry > Chapter 9: Hydrocarbons > Topic: Aromatic Hydrocarbons - Structure of Benzene and Resonance
In benzene ( C₆H₆ ), there are 6 C-C sigma bonds, 6 C-H sigma bonds, and 3 pi bonds from alternating double bonds in its ring structure.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: VSEPR Theory and Shapes of Molecules
In C₆H₆ (benzene), there are 6 C-C sigma bonds in the ring, 6 C-H sigma bonds, totaling 12 sigma bonds (plus 3 pi bonds).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Kossel-Lewis Approach and Octet Rule and Lewis Structures
Benzene and dioxins are classified as hazardous or toxic air pollutants because toxicity can occur through chronic or sometimes acute exposure and includes carcinogenic, developmental, reproductive, and immune effects. Benzene is linked especially to bone-marrow toxicity and leukaemia; several dioxin congeners are persistent and bioaccumulative. This category differs from criteria pollutants, which are regulated using broad ambient standards because of widespread exposure. Effective management combines cleaner fuels, emission standards, monitoring, urban planning, and protection of populations with high exposure or physiological vulnerability. The distinction is ecologically important because emission control must target either the directly released precursor or the product formed after atmospheric transport and reaction. Exposure depends on concentration, duration, ventilation, weather, and individual susceptibility, so a pollutant's presence alone does not fully predict biological harm. Atmospheric inversions can trap contaminants near the surface, while wind, turbulence, precipitation, and chemical transformation determine their eventual distribution and removal. At organismal level, respiratory surfaces are especially exposed because large volumes of air contact thin, moist epithelia designed for rapid gas exchange.
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
