Free Hydroxy compounds questions for AS Level Chemistry (9701), part of Organic chemistry. Each question has the answer and the marking points an examiner would look for.
Generate a full Hydroxy Compounds worksheet →All Organic chemistry questionsThree alcohols are heated separately with acidified potassium dichromate(VI).
Which row is correct?
| butan-1-ol | butan-2-ol | 2-methylpropan-2-ol | |
|---|---|---|---|
| A | butanoic acid (under reflux) | no reaction | butanone |
| B | butanone | butanal | no reaction |
| C | butanoic acid (under reflux) | butanone | no reaction |
| D | butanal only | butanoic acid | butanone |
Answer: C
What is formed when propan-2-ol is heated with acidified potassium dichromate(VI)?
Answer: C
Which term is described by this statement?
“An alcohol whose –OH carbon is bonded to only one other carbon.”
Answer: D
Alcohols react with sodium.
Write an equation for the reaction of ethanol with sodium.
Describe a test to show that a compound contains the CH₃CH(OH)– group.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂ 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂ B1 | 1 |
| (b) | alkaline iodine, yellow precipitate warm with alkaline aqueous iodine B1 yellow precipitate (CHI₃) B1 | 2 |
Alcohols can be oxidised.
State the reagents and conditions for oxidising a primary alcohol to an aldehyde.
Explain why tertiary alcohols are not oxidised.
State the colour change observed.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | acidified K₂Cr₂O₇; distil acidified potassium dichromate(VI) B1 heat and distil off the aldehyde as it forms B1 | 2 |
| (b) | no H on C bearing OH no hydrogen atom on the carbon bonded to the OH group B1 | 1 |
| (c) | orange to green orange to green B1 | 1 |
The three alcohols butan-1-ol, butan-2-ol and 2-methylpropan-2-ol are isomers of C₄H₁₀O.
Classify each alcohol as primary, secondary or tertiary.
Describe what is seen when each is warmed with acidified potassium dichromate(VI).
State the organic products from butan-1-ol when the mixture is distilled immediately and when it is heated under reflux.
Butan-2-ol is dehydrated by heating with concentrated phosphoric acid. Explain why three alkenes are formed.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | 1°, 2°, 3° primary, secondary, tertiary respectively B1 | 1 |
| (b) | 1° and 2° orange → green; 3° stays orange butan-1-ol and butan-2-ol: orange to green B1 2-methylpropan-2-ol: stays orange B1 | 2 |
| (c) | butanal; butanoic acid distil: butanal B1 reflux: butanoic acid B1 | 2 |
| (d) | but-1-ene and cis/trans but-2-ene H can be lost from C1 or C3, giving but-1-ene or but-2-ene M1 but-2-ene exists as cis and trans isomers M1 | 2 |
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Meet Riyaz →Original Cambridge-style practice questions written for mentorriyaz.in. These are not Cambridge past paper questions, and this site is not affiliated with or endorsed by Cambridge University Press & Assessment. Updated 2026-11-04. Paper generator · mentorriyaz.in