CBSE 2025, Set 3

Question

In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula C$_2$H$_7$N, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with C$_6$H$_5$SO$_2$Cl, to give a compound which dissolves in NaOH solution. Can you help Neeta to identify the compound 'X'?

Edvaya · Accepted Answer

The correct answer is Subjective. **Hinsberg's test using C$_6$H$_5$SO$_2$Cl (benzenesulphonyl chloride):** - **Primary amine** reacts with C$_6$H$_5$SO$_2$Cl to give a sulphonamide that **dissolves in NaOH** (acidic N–H on sulphonamide → NaOH deprotonates it, making it soluble). - Secondary amine gives a sulphonamide **insoluble in NaOH**. - Tertiary amine does not react. Since compound X gives a product **soluble in NaOH**, amine X is a **primary amine**. Molecular formula C$_2$H$_7$N has MW = 45. With primary amine (–NH$_2$), the only primary amine with formula C$_2$H$_7$N is: **X = CH$_3$CH$_2$NH$_2$ (Ethanamine / Ethylamine)**

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