Class 12 Chemistry · Chapter 8 · Test 2
Diazonium Salts, Azo Dyes
43 MCQs
43 questions · 40 min · 43 marks
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Sample questions
The first 5 of 43. Try each one, then tap to see the answer.
Question 1
The -NH2 group on a benzene ring directs incoming electrophiles to:
- AMeta position only
- BOrtho and para positions
- CIpso position only
- DNo position
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Answer: B
The amino group is an ortho-para director.
Question 2
Phenylamine reacts with aqueous Br2 to form:
- APhenol
- B2,4,6-tribromophenylamine
- CAn azo compound
- DNone of these
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Answer: B
All three activated positions are brominated.
Question 3
What is observed when bromine water is added to phenylamine?
- AA yellow solution
- BAn orange precipitate
- CA white precipitate forms and the bromine colour disappears
- DA black solid
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Answer: C
2,4,6-tribromophenylamine is a white precipitate.
Question 4
Phenylamine is brominated faster than benzene because:
- AThe -NH2 group deactivates the ring
- BThe -NH2 group is meta directing
- CBenzene has no pi electrons
- DThe -NH2 group activates the ring
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Answer: D
Donation from nitrogen increases the electron density of the ring.
Question 5
Which is the balanced equation for phenylamine with bromine water?
- AC6H5NH2 + 3Br2 → C6H2Br3NH2 + 3HBr
- BC6H5NH2 + Br2 → C6H4BrNH2 + HBr
- CC6H5NH2 + 3Br2 → C6H5NBr6
- DC6H5NH2 + 3Br2 → C6H2Br3OH + 3HBr
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Answer: A
Three hydrogens are replaced giving the tribromo product.
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