Class 12 Chemistry · Chapter 4 · Test 2
Electrophilic Aromatic Substitution
40 MCQs
40 questions · 40 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Alkanes are generally unreactive because of their:
- APolar nature and pi bonds
- BAromatic character
- CIonic bonds
- DNon-polar nature and sigma bonds only
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Answer: D
Alkanes are non-polar and have only sigma bonds.
Question 2
Alkanes undergo readily in the presence of UV light:
- AElectrophilic addition
- BNucleophilic addition
- CFree radical substitution
- DElectrophilic substitution
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Answer: C
UV light starts free radical substitution in alkanes.
Question 3
Alkenes are very reactive because of:
- AThe availability of pi electrons for electrophilic reagents
- BSigma bonds only
- CHydrogen bonding
- DIonic character
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Answer: A
The pi bond provides electrons for electrophiles.
Question 4
Alkenes typically undergo:
- AFree radical substitution
- BNucleophilic substitution
- CElimination only
- DElectrophilic addition
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Answer: D
Alkenes easily undergo electrophilic addition.
Question 5
Compared with alkenes benzene is:
- AMore reactive
- BLess reactive because of its extra stability
- CEqually reactive
- DNon-aromatic
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Answer: B
Benzene is very stable and thus less reactive towards electrophiles.
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