In each of the following pairs a test is suggested to distinguish the two compounds. Select all pairs where the test works.

Abutan-1-ol and butan-2-ol: Tollens reagent
Bethanol and methanol: warm with $I X_{2} / NaOH$
Cphenol and phenylmethanol: neutral $FeCl X_{3}$
Dpropan-1-ol and propan-2-ol: Lucas reagent at room temperature, observed for 5 to 10 minutes

Answer: B, C, D

Ethanol gives yellow

CHI X_{3}

while methanol does not. Propan-2-ol becomes turbid within about 5 minutes with Lucas reagent while propan-1-ol stays clear, and phenol gives a violet colour whereas phenylmethanol does not. Neither butanol reacts with Tollens reagent, so it cannot distinguish them.

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