Cambridge International AS Level · Chemistry (9701)
5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Hydroxy compounds.
An organic compound X has the molecular formula \( C_3H_8O \). When X is heated under reflux with acidified potassium dichromate(VI), the solution changes from orange to green and a carboxylic acid is formed.
What is the identity of X?
Which compound will produce a yellow precipitate when reacted with alkaline aqueous iodine?
An organic molecule Z contains the \(CH_3CH(OH)-\) group. When Z is heated with concentrated \(H_2SO_4\), it forms an alkene that can exist as a pair of geometrical (cis/trans) isomers.
Which alcohol is Z?
When an alcohol is reacted with sodium metal, a gas is evolved. What is the identity of this gas?
The dehydration of butan-2-ol using concentrated sulfuric acid at \( 170^\circ C \) can produce a mixture of alkenes.
How many structural isomers (excluding stereoisomers) are formed in this reaction?
Identify the observations and the organic product formed when propan-2-ol is heated with acidified potassium dichromate(VI) under distillation conditions.
Write your answer out first, then check it against the worked solution.
A student has three isomeric alcohols with the molecular formula \( C_4H_{10}O \): butan-1-ol, butan-2-ol, and 2-methylpropan-2-ol.
Describe how the student can use a single reagent and specific reaction conditions to distinguish the tertiary alcohol from the other two, and state the expected observation for each.
Write your answer out first, then check it against the worked solution.
Compound X is a secondary alcohol with the molecular formula \(C_{3}H_{8}O\).
(a) Draw the displayed formula of Compound X.
(b) Compound X reacts with acidified potassium dichromate(VI) under distillation. State the name of the organic product formed and the color change observed in the reagent.
(c) When Compound X is reacted with alkaline aqueous iodine, a yellow precipitate is formed. Name the precipitate and write the formula of the organic anion produced.
Write your answer out first, then check it against the worked solution.
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