Class 12 Chemistry · Chapter 5 · Test 2
Substitution and Elimination
46 MCQs
46 questions · 40 min · 46 marks
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Sample questions
The first 5 of 46. Try each one, then tap to see the answer.
Question 1
The two main types of reaction of halogenoalkanes are:
- AAddition and polymerisation
- BNucleophilic substitution and elimination
- COxidation and reduction
- DCondensation and hydrolysis
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Answer: B
The polar C-X bond allows attack by nucleophiles (substitution) or by bases (elimination).
Question 2
In a nucleophilic substitution reaction of a halogenoalkane:
- AThe halogen atom is replaced by another atom or group
- BThe halogen atom is added to a double bond
- CA hydrogen halide is removed
- DThe carbon skeleton is oxidised
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Answer: A
Substitution means the halogen is replaced by the nucleophile.
Question 3
The carbon of the C-X bond is attacked by nucleophiles because it is:
- AElectron rich
- BA free radical
- CPartially positive due to the more electronegative halogen
- DFully negatively charged
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Answer: C
The polar bond makes carbon an electrophilic centre.
Question 4
In an elimination reaction the base attacks the:
- AHalogen atom
- BCarbon bearing the halogen
- CAlkyl group
- DHydrogen on the adjacent carbon (beta-hydrogen)
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Answer: D
The base removes a beta-hydrogen as HX is eliminated.
Question 5
SN2 stands for:
- ANucleophilic substitution bimolecular
- BNucleophilic substitution unimolecular
- CElectrophilic substitution bimolecular
- DNucleophilic addition bimolecular
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Answer: A
SN2 is nucleophilic substitution bimolecular.
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