Silver nitrate test identifies halide precipitates by color

Steps:

• Aqueous AgNO3 reacts with alkyl halides to form insoluble AgX precipitates via SN1 mechanism in polar solvent.
• 2-Bromopropane (R-Br) yields AgBr, a pale yellow precipitate.
• 2-Iodopropane (R-I) yields AgI, a yellow precipitate.
• The test confirms both form precipitates, but colors distinguish bromide (pale yellow) from iodide (yellow).

Why C is correct:

• Option C correctly identifies yellow precipitate for 2-bromopropane with AgNO3(aq), matching AgBr formation as per halide reactivity series.

Why the others are wrong:

• A incorrectly suggests no precipitate or unspecified reaction for both compounds.
• B wrongly attributes yellow precipitate only to 2-iodopropane, ignoring bromide's reaction.
• D misplaces yellow observation solely to 2-iodopropane without addressing bromide.

Final answer: C