Presence of nitrogen in organic compounds is tested as__________?
Correct answer: C. CN‾
- A. Nitrogen gas
- B. NH3
- C. CN‾
- D. NO
Explanation
In Lassaigne's sodium-fusion test, nitrogen in an organic compound is converted into sodium cyanide, NaCN. On ionisation, this provides the cyanide ion, CN-, which is the species tested in the qualitative analysis. The likely distractor is NH3, option b, because students may confuse nitrogen detection with the ammonia test used for some other elements.
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Functional groups are specific atoms or atom groups that determine the characteristic reactions and properties of organic compounds. Coverage includes alkenes, alkynes, halo, hydroxyl, ether, carbonyl, carboxyl, ester, amino and nitro groups, together with their structures, nomenclature and related homologous series.
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