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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