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The colour of bromine water disappearing when added to a carbon compound is a test for the presence of a:
ACarboxylic acid group
BSingle bond
CMultiple bond
DHydroxyl group
Answer & Solution
Correct answer: C. Multiple bond
1. Unsaturated compounds undergo an addition reaction with bromine at room temperature.
2. As bromine adds across the bond, its colour disappears.
3. This instant colour change detects a multiple (double or triple) bond.
4. Rule out B: a single bond is saturated and does not decolourise bromine.
5. Rule out A: a carboxylic acid group is detected by its acidity, not by bromine.
6. Rule out D: a hydroxyl group reacts with sodium, not by decolourising bromine.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.134_
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