(1) Aqueous solution of carboxylic acids turn blue litmus into red colour. (2) Carboxylic acids give brisk effervescence with sodium bicarbonate due to the evolution of CO2.
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Q1
Give any two tests to identify carboxylic acids.
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Q2
List two tests for experimentally distinguishing alcohol and carboxylic acids.
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Q3
Describe a test for carboxylic acids.
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Q4
A compound (X) with a molecular formula C5H10O gives a positive 2,4-DNP test but a negative Tollen's test. On oxidation it gives a carboxylic acid (Y) with a molecular formula C3H6O2. Potassium salt of (Y) undergoes Kolbe's reaction and gives a hydrocarbon (Z) Identify (X).(Y) and (Z).
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Q5
List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed.