Number of compounds which give reaction with Hinsberg's reagent is_______.
Correct Answer: 5
Solution and Explanation
Understanding Hinsberg's Test
Hinsberg's reagent (benzene sulfonyl chloride, \( C_6H_5SO_2Cl \)) is used to distinguish between primary, secondary, and tertiary amines:
Primary amines react to form sulfonamides, which are soluble in alkali.
Secondary amines react to form sulfonamides that are insoluble in alkali.
Tertiary amines do not react with Hinsberg's reagent.
Analyzing the Given Compounds
The compound containing \( \text{NH}_2 \) group (primary amine) reacts with Hinsberg's reagent.
The compound containing a secondary amine (\( -\text{NH}- \) group) also reacts.
Tertiary amines (\( -\text{N}- \)) do not react with Hinsberg's reagent.
Amides and other compounds that do not contain free primary or secondary amine groups will not react.
Counting the Reactive Compounds
After analyzing the given structures, there are \textbf{5 compounds} containing primary or secondary amines that will react with Hinsberg's reagent.
Conclusion
The number of compounds that give a reaction with Hinsberg's reagent is 5.
Top Questions on Amines
Which of the following amines does not give foul smell of isocyanide on heating with chloroform and ethanolic KOH ?
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- An amine ‘X’ reacts with Hinsberg reagent and the product obtained is insoluble in alkali. The amine ‘X’ is:
Amines are usually formed from amides, imides, halides, nitro compounds, etc. They exhibit hydrogen bonding which influences their physical properties. In alkyl amines, a combination of electron releasing, steric and H-bonding factors influence the stability of the substituted ammonium cations in protic polar solvents and thus affect the basic nature of amines. Alkyl amines are found to be stronger bases than ammonia. Amines being basic in nature, react with acids to form salts. Aryldiazonium salts, undergo replacement of the diazonium group with a variety of nucleophiles to produce aryl halides, cyanides, phenols and arenes.
How can you convert the following:
(i) Ethanoic acid to methanamine
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