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Which of the following compounds to does not show Lassaigne's test for nitrogen?
- a)Urea
- b)Hydrazine
- c)Phenylhydrazine
- d)Azobenzene
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which of the following compounds to does not show Lassaigne's test for...
This is further used in the test for nitrogen. Hydrazine (H2N−NH2) do not contain carbon. It cannot form NaCN on fusion with sodium. Hence, hydrazine cannot give Lassaigne's test for nitrogen
Community Answer
Which of the following compounds to does not show Lassaigne's test for...
Explanation:
Lassaigne's test is used to detect the presence of nitrogen in an organic compound. When an organic compound containing nitrogen is heated with sodium metal, sodium combines with nitrogen to form sodium cyanide. This sodium cyanide is then hydrolyzed to form sodium hydroxide and ammonia gas. The ammonia gas evolved can be tested using Nessler's reagent or by observing the smell of ammonia.
Out of the given options, hydrazine is the only compound that does not show Lassaigne's test for nitrogen. This is because hydrazine is a compound that contains only nitrogen and hydrogen atoms. When hydrazine is heated with sodium metal, it reacts with sodium to form sodium hydrazide (NaNH2) instead of sodium cyanide. Sodium hydrazide does not react with water to release ammonia gas, hence hydrazine does not show Lassaigne's test for nitrogen.
Therefore, the correct answer is option 'B', i.e., Hydrazine.
Lassaigne's test is used to detect the presence of nitrogen in an organic compound. When an organic compound containing nitrogen is heated with sodium metal, sodium combines with nitrogen to form sodium cyanide. This sodium cyanide is then hydrolyzed to form sodium hydroxide and ammonia gas. The ammonia gas evolved can be tested using Nessler's reagent or by observing the smell of ammonia.
Out of the given options, hydrazine is the only compound that does not show Lassaigne's test for nitrogen. This is because hydrazine is a compound that contains only nitrogen and hydrogen atoms. When hydrazine is heated with sodium metal, it reacts with sodium to form sodium hydrazide (NaNH2) instead of sodium cyanide. Sodium hydrazide does not react with water to release ammonia gas, hence hydrazine does not show Lassaigne's test for nitrogen.
Therefore, the correct answer is option 'B', i.e., Hydrazine.
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Which of the following compounds to does not show Lassaigne's test for nitrogen?a)Ureab)Hydrazinec)Phenylhydrazined)AzobenzeneCorrect answer is option 'B'. Can you explain this answer?
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