General Science • ChemistryHard
Match the organic functional group tests in List I with their corresponding characteristic observations in List II and select the correct matching code: List I (Chemical Test) 1. Tollen Test 2. Lucas Test 3. Carbylamine Test 4. Iodoform Test List II (Observation) 1. Formation of a shining silver mirror on the inner walls of the test tube 2. Turbidity appearance distinguishing primary, secondary, and tertiary alcohols 3. Formation of foul-smelling offensive isocyanide compounds 4. Precipitation of bright yellow crystals of triiodomethane
A. 1-1, 2-2, 3-3, 4-4✓ Correct Answer
B. 1-2, 2-1, 3-4, 4-3
C. 1-3, 2-4, 3-1, 4-2
D. 1-4, 2-3, 3-2, 4-1
💡 Solution & Explanation
Tollen test uses ammoniacal silver nitrate to detect aldehydes, producing a silver mirror. Lucas test utilizes anhydrous zinc chloride in concentrated hydrochloric acid to differentiate alcohol classes based on turbidity reaction rates. Carbylamine test identifies primary amines by reacting them with chloroform and alcoholic KOH to yield foul-smelling isocyanides. Iodoform test confirms methyl ketones and secondary alcohols containing the CH3-CH-OH group through yellow precipitate formation.
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