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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Chemistry Test1.
Explain why amines are more basic than amides.
2.
Explain why aniline is less basic than methylamine?
3.
What happens when aniline is treated with bromine?
4.
How will you distinguish between ethylamine and diethylamine?
5.
What happens when acetonitrile is hydrolysed?
1.
In simple amines the lone pair of electrons is on nitrogen and hence available for protonation. In amides, on the other hand, the electron pair on nitrogen is delocalized to the carbonyl oxygen through resonance.
2.
(i) The lone pair of electrons on the nitrogen atom of aniline is involved in resonance and not available for donation to protons.
(ii) Protonation becomes difficult.
(iii) So aniline is a weaker base than methylamine.
3.
Aniline decolourises bromine water with the formation of white precipitate which is 2,4,6-tribromo aniline
4.
| S. NO. |
Ethylamine | Diethylamine |
| i. | It reacts with CHCl3 and KOH forms carbylamine. | It does not react with CHCl3 and KOH. |
| ii. | It reacts with HNO2 and forms ethyl alcohol. | It reacts with HNO2 and form N-nitroso amine (Yellowish oil). |
5.
When acetonitrile is hydrolysed in the presence of acid medium, acetic acid is formed.
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