Number of compounds which give reaction with Hinsberg's reagent is_______.
Correct Answer: 5
Approach Solution - 1
To determine the number of compounds that react with Hinsberg's reagent, we need to identify the compounds containing primary or secondary amines. Hinsberg's reagent (benzenesulfonyl chloride) reacts with:
- Primary amines to form sulfonamides, which are soluble in alkali.
- Secondary amines to form sulfonamides, which are insoluble in alkali.
- Tertiary amines do not react with Hinsberg’s reagent.
Let's examine the given compounds:
- Benzenediazonium chloride: Not an amine.
- Amide (RCONH2): Contains an amide group, not reactive.
- Aniline (C6H5NH2): Primary amine, reactive.
- Pyridine: Tertiary amine, not reactive.
- Piperidine: Secondary amine, reactive.
- Morpholine: Secondary amine, reactive.
- Methylamine (CH3NH2): Primary amine, reactive.
- Ethylenediamine: Primary amine, reactive.
- Urea: Contains an amide group, not reactive.
The reactive compounds are:
- Aniline
- Piperidine
- Morpholine
- Methylamine
- Ethylenediamine
These total to five compounds, which fits within the given range of 5,5.
Therefore, the number of compounds that react with Hinsberg's reagent is: 5
Approach Solution -2
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.
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