Compound that will give positive Lassaigne’s test for both nitrogen and halogen is
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For Lassaigne’s test:
• Organic compounds must contain nitrogen or halogens for detection.
• Both nitrogen and halogen must be part of the same compound to test positive for both.
CH3NH2.HCl
NH2OH .HCl
NH4Cl
N2H4 . HCl
The Correct Option is A
Solution and Explanation
1. Lassaigne’s Test: This test detects nitrogen, sulfur, and halogens in organic compounds.
- The compound is fused with sodium, converting nitrogen into NaCN and halogen into NaX (\(X = \text{Cl, Br, I}\)).
2. Compound Analysis:
\(\text{N}_2\text{H}_4\cdot\text{HCl}\): Contains nitrogen but no halogen.
\(\text{CH}_3\text{NH}_2\cdot\text{HCl}\): Contains both nitrogen (from the \(-\text{NH}_2\) group) and halogen (\(\text{Cl}\) from \(\text{HCl}\)).
\(\text{NH}_4\text{Cl}\): Contains nitrogen and halogen but is not an organic compound.
\(\text{NH}_2\text{OH}\cdot\text{HCl}\): Contains nitrogen and halogen but does not form the required products in Lassaigne’s test.
3. Conclusion: Only \(\text{CH}_3\text{NH}_2\cdot\text{HCl}\) gives a positive Lassaigne’s test for both nitrogen and halogen.
Final Answer: (2) \(\text{CH}_3\text{NH}_2\cdot\text{HCl}\).
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