Pour two samples of heptane and two samples of cyclohexene into separate test tubes in a lighted rack. Add one or two drops of 1% bromine in dichloromethane to one sample of each hydrocarbon. Compare ...

Pour two samples of heptane and two samples of cyclohexene into separate test tubes in a lighted rack. Add one or two drops of 1% bromine in dichloromethane to one sample of each hydrocarbon. Compare ...

Hydroxyisohexyl 3-cyclohexene carboxaldehyde or HICC, and butylphenyl methylpropional (BMHCA) – both fragrance ingredients and skin sensitisers – are banned by the European Union.