Q58Written answer
Identify A and B in the following reaction.
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NCERT Exemplar · Class 12 · Chemistry
Chapter 13: Amines
Practice each question, then open the answer or worked solution.
Short Answer Questions
37 questionsQ59Written answer
How will you carry out the following conversions?
(i) toluene $\rightarrow$ p-toluidine
(ii) p-toluidine diazonium chloride $\rightarrow$ p-toluic acid
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Q60Written answer
Write following conversions:
(i) nitrobenzene $\rightarrow$ acetanilide
(ii) acetanilide $\rightarrow$ p-nitroaniline
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Q61Written answer
A solution contains 1 g mol each of p-toluene diazonium chloride and p-nitrophenyl diazonium chloride. To this 1 g mol of alkaline solution of phenol is added. Predict the major product. Explain your answer.
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This is an example of an electrophilic aromatic substitution reaction. phenol generates phenoxide ion in alkaline medium, which is more electron-rich than phenol and thus more reactive to electrophilic attack. In this reaction, the electrophile is an aryldiazonium cation.
The faster the reaction, the stronger the electrophile.
The cation p-nitrophenyldiazonium is a stronger electrophile than the cation p-toluene diazonium.
As a result, it preferentially couples with phenol.
Q62Written answer
How will you bring out the following conversion?
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Q63Written answer
How will you carry out the following conversion?
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Q64Written answer
How will you carry out the following conversion?
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Q65Written answer
How will you carry out the following conversion?
(i)
(ii)
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Q66Written answer
Match the reactions given in Column I with the statements given in Column II.
Column I | Column II |
(i) Ammonolysis | (a) Amine wth lesser number of carbon atoms |
(ii)Gabriel phthalimide synthesis | (B) Detection test for primary amines. |
(iii) Hoffmann Bromide reaction | (c) Reaction of phthalimide with KOH and R-X |
(iv) Carbylamine reaction | (d) Reaction of aljylhalides with $\mathrm{NH}_{3}$ |
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Ans: (i)-(d), (ii)-(c), (iii)-(a), (iv)-(B)
Ammonolysis: $\mathrm{R}-\mathrm{X}+\mathrm{NH}_{3} \rightarrow \mathrm{RNH}_{2}+\mathrm{HCl}$
Carbylamine reaction:
Hoffmann bromamide reaction:
$\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)\left(\mathrm{CH}_{3}\right) \mathrm{CH}-\mathrm{CONH}_{2} \frac{\mathrm{Br} 2 / \mathrm{NaOH}}{\underset{\text { reaction }}{\text { Hoffmannmbromamide }}}\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)\left(\mathrm{CH}_{3}\right) \mathrm{CH}-\mathrm{NH}_{2}$
Q67Written answer
Match the compounds given in Column I with the items given in Column II.
Column I | Column II |
(i) Benzene sulphonyl chloride | (a) Zwitter ion |
(ii) Sulphanilic acid | (B) Hinsberg reagent |
(iii) Alkyl diazonium salts | (c) Dyes |
(iv) Aryl diazonium salts | (d) Conversion to alcohols |
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Column I | Column II |
(i) Benzene sulphonyl chloride | (B) Hinsberg reagent |
(ii) Sulphanilic acid | (a) Zwitter ion |
(iii) Alkyl diazonium salts | (d) Conversion to alcohols |
(iv) Aryl diazonium salts | (c) Dyes |
In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices:
(a) Both Assertion and Reason are wrong.
(B) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
(c) Assertion is correct but Reason is wrong.
(d) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(e) Assertion is wrong but Reason is correct.