Class 12 Chemistry · Chapter 4 · Test 3
Benzene Orientation and Reactions
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
A group that makes the ring more reactive than benzene and directs the electrophile to the ortho and para positions is called an:
- AMeta director
- BDeactivating group
- COrtho-para director (activating group)
- DFree radical
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Answer: C
Such groups activate the ring and favour positions 2 and 4.
Question 2
Which pair are both ortho-para directing groups?
- A-CN and -NO2
- B-OH and -R
- CC=O and -NO2
- D-CN and C=O
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Answer: B
-OH and -R are electron donating and ortho-para directing.
Question 3
Ortho-para directing groups are generally:
- ANeutral
- BFree radicals
- CElectron withdrawing
- DElectron donating
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Answer: D
They donate electrons to the benzene ring.
Question 4
Among the ortho and para products of an activating group there is a slight preference for:
- AOrtho
- BMeta
- CIpso
- DPara
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Answer: D
The para product is slightly preferred.
Question 5
Meta directing groups are mostly:
- AElectron withdrawing
- BElectron donating
- CNeutral
- DAlkyl groups
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Answer: A
Electron-withdrawing groups destabilise the arenium intermediate.
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