Bromine Test Identifies Unsaturated Hydrocarbons

Steps:

• Unsaturated compounds contain C=C or C≡C bonds and react with Br₂(aq) by decolorizing it via electrophilic addition.
• Saturated compounds lack multiple bonds and do not react with Br₂(aq).
• Assume P is saturated (e.g., alkane) based on no reaction; Q is unsaturated (e.g., alkene).
• Thus, Q is unsaturated and reacts with aqueous bromine.

Why D is correct:

• D states both properties apply to Q, matching the definition of unsaturation and bromine reactivity for alkenes/alkynes.

Why the others are wrong:

• A: Incorrectly assigns unsaturation to P and reaction to Q.
• B: Incorrectly assigns unsaturation to Q but reaction to P.
• C: Incorrectly assigns both to P, which is saturated.

Not enough information on P and Q structures to confirm without assumptions.

Final answer: D