Which one of the following compounds does not decolourize bromine water?

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Question

Which one of the following compounds does not decolourize bromine water?

Accepted Answer

Correct Answer: B — Option 2Step-by-step Solution:Bromine water (reddish-brown) is decolourised by compounds that react with Br₂ through addition or oxidation. Based on the official answer key, Option 2 does NOT decolourise bromine water.Key Concepts:Compounds that DO decolourise Br₂ water:Alkenes: addition across C=C (e.g., CH₂=CH₂ + Br₂ → CH₂BrCH₂Br)Alkynes: addition across C≡CAldehydes: oxidised by Br₂ (RCHO + Br₂ + H₂O → RCOOH + 2HBr)Phenol: undergoes EAS → 2,4,6-tribromophenol (white ppt)Compounds that do NOT decolourise Br₂ water:Saturated hydrocarbons (alkanes) — no reactive site under normal conditionsBenzene — requires Lewis acid catalyst (FeBr₃) for substitution; does not react with Br₂ water aloneKetones — do not react with Br₂ water (unlike aldehydes)

Which one of the following compounds does not decolourize bromine water?

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Which one of the following compounds does not decolourize bromine water?

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More Questions from Organic Chemistry - Some Basic Principles and Techniques

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