Class 12 Chemistry · Chapter 5 · Test 3
Halogenoalkane Reactions and Uses
48 MCQs
48 questions · 40 min · 48 marks
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Sample questions
The first 5 of 48. Try each one, then tap to see the answer.
Question 1
Bromoethane heated under reflux with aqueous NaOH gives which substitution product?
- AEthanol
- BEthene
- CEthanal
- DEthanoic acid
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Answer: A
Hydroxide replaces bromine: C2H5Br + NaOH → C2H5OH + NaBr.
Question 2
The elimination product of bromoethane with hydroxide ion is:
- AEthanol
- BEthene
- CEthane
- DEthanal
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Answer: B
The base removes HBr to give the alkene.
Question 3
Reactions of halogenoalkanes with NaOH are carried out under reflux to:
- AIncrease the colour
- BRemove oxygen
- CAvoid loss of volatile products
- DDissolve the base
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Answer: C
Reflux prevents volatile products escaping at higher temperature.
Question 4
Hydroxide ion can act as a nucleophile (giving substitution) and as a:
- ACatalyst
- BFree radical
- CAcid
- DBase (giving elimination)
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Answer: D
As a base it removes a beta hydrogen and the halogen leaves to form an alkene.
Question 5
Which conditions favour elimination of HBr from bromoethane?
- ANaOH dissolved in ethanol and heat
- BAqueous KCN
- CAqueous AgNO3
- DDilute HCl
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Answer: A
Ethanolic NaOH heated gives the alkene.
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