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4.2.1 alcohols

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Total cards: 5•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

distillation of primary alcohol

Back (Answer)

Primary alcohol > aldehyde potassium dichromate (VI) solution and dilute H2SO4 Warm gently and distil out the aldehyde as it forms Orange dichromate ion (Cr2O7 2-) reduces to green Cr3+ ion

#2
Front (Question)

Reflux primary alcohol

Back (Answer)

Primary alcohol > carboxylic acid Reagent: potassium dichromate (VI) solution and dilute H2SO4 Conditions: use excess dichromate, heat under reflux Orange dichromate ion > green Cr3+ ion + H2O, 2 [O]

#3
Front (Question)

Reflux of secondary alcohol

Back (Answer)

Secondary alcohol > ketone Potassium dichromate (VI) and dilute H2SO4 Heat under reflux Orange dichromate to green Cr3+ Ion

#4
Front (Question)

Alcohol and dehydrating agents

Back (Answer)

Alcohol > alkene Concentration sulfuric or phosphoric acid - acts as dehydrating agent Conditions : warm (under reflux) Type of reaction: acid catalysed elimination

#5
Front (Question)

Alcohol to haloalkane

Back (Answer)

Concentrated sulfuric acid and sodium halide