Lesson 3.3.5.3
3.3.5.3 Alcohols: Elimination Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.5.3, Alcohols: Elimination: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
What type of reaction forms an alkene from an alcohol?
- Addition
- Free-radical substitution
- Elimination (dehydration)
- Oxidation
-
Which reagent acts as a catalyst in the dehydration of an alcohol to an alkene?
- Iron catalyst
- Concentrated sulfuric acid
- Dilute sodium hydroxide
- Nickel catalyst
-
What is the product of heating cyclohexanol with an acid catalyst?
- Cyclohexanoic acid
- Cyclohexene
- Cyclohexane only
- Cyclohexanone
-
What is the first step in the acid-catalysed elimination of water from an alcohol?
- Deprotonation of CH
- Protonation of OH
- Loss of water
- Formation of C=C
-
In the mechanism of acid-catalysed alcohol elimination, what is the intermediate formed after water leaves?
- A carbanion
- A carbocation
- A free radical only
- An ester
-
Which compound is formed when ethanol is dehydrated with concentrated sulfuric acid at high temperature?
- Ethanal
- Ethanoic acid
- Ethene
- Ethane
-
What advantage do alkenes made from bio-ethanol have over alkenes from crude oil?
- Higher purity
- Lower boiling point
- Renewable source
- Higher reactivity
-
Which alcohol is most suitable for making cyclohexene in the required practical?
- Cyclohexane
- Cyclohexanol
- Cyclohexanone
- Cyclohexanoic acid
-
Which apparatus is used to separate cyclohexene from the aqueous layer during purification?
- Reflux apparatus
- Liebig condenser
- Separating funnel
- Büchner funnel
-
What is the molecular formula of the alkene formed by dehydrating butan-2-ol?
- C4H10O
- C4H6
- C4H8
- C4H10
-
What is the balanced equation for the dehydration of ethanol to ethene?
- C2H5OH -> C2H4O + H2
- 2C2H5OH -> C2H4 + 2H2O
- C2H5OH -> C2H4 + H2O
- C2H5OH -> C2H6 + O
-
Which product is formed from the elimination of water from propan-2-ol?
- Propanal
- Propan-1-ol
- Propanone
- Propene
-
Why is the more substituted alkene the major product in an elimination reaction?
- Lower boiling point
- Higher volatility
- Greater stability
- Lower mass
-
Which reagent is used in the dehydration of cyclohexanol in the laboratory practical?
- Bromine water
- Sodium hydroxide
- Silver nitrate
- Concentrated phosphoric acid
-
Why is an acid catalyst required for the dehydration of an alcohol?
- Improves leaving group
- Neutralises product
- Lowers reaction temperature
- Increases boiling point
-
Which species is removed as a by-product when an alcohol is dehydrated?
- Carbon dioxide
- Sodium chloride
- Water
- Hydrogen gas
-
Which feature of alkenes allows them to form addition polymers?
- Carbon-carbon double bond
- High volatility
- Carbonyl group
- Hydroxyl group
-
What is the role of the acid catalyst in the elimination reaction of an alcohol?
- Reduces carbon skeleton
- Protonates hydroxyl group
- Acts as nucleophile
- Oxidises hydroxyl group
-
Which reaction type is the reverse of the acid-catalysed dehydration of an alcohol?
- Hydration of alkene
- Hydrogenation of alkene
- Halogenation of alkane
- Hydrolysis of haloalkane
-
Which alcohol produces only one alkene product upon acid-catalysed dehydration?
- Pentan-3-ol
- Butan-2-ol
- Pentan-2-ol
- Ethanol
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