Product of 2 bromopropane undergoes dehydrohalogenation reaction
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The color of chemicals is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical. What is seen by the eye is not the color absorbed, but the complementary color from the removal of the absorbed wavelengths. This spectral perspective was first noted in atomic spectroscopy.
The study of chemical structure by means of energy absorption and release is generally referred to as spectroscopy.
Here ethyl chloride reacts with potassium hydroxide dissolved in ethanol, giving ethylene. Likewise, 1-chloropropane and 2-chloropropane give propene. In general, the reaction of haloalkane with potassium hydroxide can compete with an SN2 nucleophilic substitution reaction by OH− a strong, unhindered nucleophile.