Chemistry · Unit 4 · Properties and structure of organic materials · Structure of organic compounds
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A student performs chemical tests on three unknown alcohols labelled P, Q and R. Each alcohol is treated with acidified potassium dichromate(VI) solution and warmed. The observations are recorded in the table below. Further testing shows that alcohol Q produces a silver mirror when warmed with Tollens' reagent, while alcohol R does not. Which statement correctly interprets these test results?
A student conducts acidified potassium permanganate tests on two samples: Sample X remains purple, while Sample Y causes the solution to become colourless. Interpret these test results to identify which sample is an alkane and which is an alkene.
A student performs the Lucas test on four different alcohols: butan-1-ol, 2-methylpropan-2-ol, pentan-2-ol, and propan-1-ol. The Lucas reagent (concentrated \(\text{HCl}\) and \(\text{ZnCl}_2\)) is added to each sample at room temperature and the time taken for cloudiness to appear is recorded. Which alcohol would produce cloudiness most rapidly?