A convenient reagent to distinguish ethyl alcohol from n-propyl alcohol is
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Video Explanation. (i) Ethyl alcohol and sec-propyl alcohol are distinguished by Lucas reagent (a mixture of conc. HCl and anhydrous zinc chloride). Secondary alcohols such as sec-propyl alcohol gives turbidity within 5-10 minutes.
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A convenient reagent to distinguish ethyl alcohol from n-propyl alcohol is the iodoform test.
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Alcohols containing CH₃-CH(OH)- group respond to haloform reaction and give a positive haloform test. This is because such alcohol on oxidation with halogen acquires CH₃-CO- group.
Ethyl alcohol responds to haloform reaction as it contains CH₃-CH(OH)- group. Ethyl alcohol reacts with sodium hypohalite(NaOH + I₂), and the iodoform is formed as a bright yellow precipitate.
The reaction is given below.
CH₃CH₂OH + I₂ + NaOH → HCOONa + CHI₃ + 5NaI + 5H₂O
n-propyl alcohol do not respond to haloform reaction.
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