Categories: Chemistry WAEC

Which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol

A. H+ / K2Cr2O7
B. I2 / OH-
C. CH3COOH
D. NaCl

Correct Answer:

Option A = H+ / K2Cr2O7

Explanation

When a primary alcohol like ethanol is warmed with excess of an oxidizing reagent, such as acidified Potassium permanganate (KMnO4) or acidified Potassium dichromate (VI) (K2Cr2O7), it is oxidized first to ethanal then to ethanoic acid, WHILE

Secondary alcohols like butan-2-ol will be oxidized to alkanones

propan-1-ol – primary alcohol,

propan-2-ol- secondary alcohol

– The Lucas test in alcohols is a test to differentiate between primary, secondary, and tertiary alcohols. It is based on the difference in reactivity of the three classes of alcohols with hydrogen halides

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