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Which of the following compound gives dye test ?
- a)Aniline
- b)Methylamine
- c)Diphenyl amine
- d)Ethylamine
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following compound gives dye test ?a) ...
Answer:
The dye test is a test used to identify aromatic amines, which are compounds containing an amine group (-NH2) attached to an aromatic ring. Aniline is an aromatic amine and is the only compound among the given options that gives a positive dye test.
Dye test:
The dye test involves the reaction of an aromatic amine with sodium nitrite (NaNO2) in the presence of hydrochloric acid (HCl). This reaction forms a diazonium salt intermediate, which then reacts with a suitable coupling agent to produce a colored dye.
Explanation:
Aniline is an aromatic amine with the chemical formula C6H5NH2. It consists of a benzene ring (an aromatic ring) with an amino group (-NH2) attached to it.
When aniline is treated with sodium nitrite and hydrochloric acid, it undergoes diazotization. Diazotization is the process of converting an amine group (-NH2) into a diazonium salt (-N2+).
The reaction can be represented as follows:
C6H5NH2 + NaNO2 + HCl → C6H5N2+Cl- + NaCl + H2O
The diazonium salt formed in the reaction can then react with a suitable coupling agent to produce a colored dye. The specific coupling agent used depends on the desired color of the dye.
In the case of aniline, the coupling agent used is usually phenol (C6H5OH). The diazonium salt reacts with phenol to form a colored dye known as an azo dye. The color of the dye depends on the specific substituents present on the aromatic ring.
Therefore, aniline gives a positive dye test because it can undergo diazotization and subsequent coupling with phenol to produce a colored dye.
Conclusion:
Among the given options, aniline is the compound that gives a positive dye test. Aniline is an aromatic amine that can undergo diazotization and subsequent coupling with a suitable coupling agent to produce a colored dye. The dye test is used to identify aromatic amines, and aniline is the only compound among the given options that is an aromatic amine.
The dye test is a test used to identify aromatic amines, which are compounds containing an amine group (-NH2) attached to an aromatic ring. Aniline is an aromatic amine and is the only compound among the given options that gives a positive dye test.
Dye test:
The dye test involves the reaction of an aromatic amine with sodium nitrite (NaNO2) in the presence of hydrochloric acid (HCl). This reaction forms a diazonium salt intermediate, which then reacts with a suitable coupling agent to produce a colored dye.
Explanation:
Aniline is an aromatic amine with the chemical formula C6H5NH2. It consists of a benzene ring (an aromatic ring) with an amino group (-NH2) attached to it.
When aniline is treated with sodium nitrite and hydrochloric acid, it undergoes diazotization. Diazotization is the process of converting an amine group (-NH2) into a diazonium salt (-N2+).
The reaction can be represented as follows:
C6H5NH2 + NaNO2 + HCl → C6H5N2+Cl- + NaCl + H2O
The diazonium salt formed in the reaction can then react with a suitable coupling agent to produce a colored dye. The specific coupling agent used depends on the desired color of the dye.
In the case of aniline, the coupling agent used is usually phenol (C6H5OH). The diazonium salt reacts with phenol to form a colored dye known as an azo dye. The color of the dye depends on the specific substituents present on the aromatic ring.
Therefore, aniline gives a positive dye test because it can undergo diazotization and subsequent coupling with phenol to produce a colored dye.
Conclusion:
Among the given options, aniline is the compound that gives a positive dye test. Aniline is an aromatic amine that can undergo diazotization and subsequent coupling with a suitable coupling agent to produce a colored dye. The dye test is used to identify aromatic amines, and aniline is the only compound among the given options that is an aromatic amine.
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Question Description
Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer?.
Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following compound gives dye test ?a) Aniline b) Methylamine c) Diphenyl amine d) Ethylamine Correct answer is option 'A'. Can you explain this answer?.
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