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NEET 2025
Exam
NEET
Year
2025
Subject
Chemistry
Chapter
General Organic Chemistry

NEET 2025 · Chemistry · General Organic Chemistry

Which one of the following reactions does NOT belong to...

Which one of the following reactions does NOT belong to "Lassaigne's test" ?

Options

  1. ANa+C+N→ΔNaCN\mathrm{Na}+\mathrm{C}+\mathrm{N} \xrightarrow[\Delta]{ } \mathrm{NaCN}
  2. B2Na+S→ΔNa2 S2 \mathrm{Na}+\mathrm{S} \xrightarrow[\Delta]{ } \mathrm{Na}_2 \mathrm{~S}
  3. CNa+X→Δ⟶+NaX\mathrm{Na}+\mathrm{X} \xrightarrow[\Delta]{\longrightarrow}+\mathrm{NaX}
  4. D2CuO+C→Δ2Cu+CO22 \mathrm{CuO}+\mathrm{C} \xrightarrow[\Delta]{ } 2 \mathrm{Cu}+\mathrm{CO}_2

Correct answer

D. 2CuO+C→Δ2Cu+CO22 \mathrm{CuO}+\mathrm{C} \xrightarrow[\Delta]{ } 2 \mathrm{Cu}+\mathrm{CO}_2

Step-by-step solution

2CuO+C2 \mathrm{CuO}+\mathrm{C}\xrightarrow[\Delta]{ }2Cu+CO2"Lassaigne′stest"isusedtodetectNitrogen,Halogen,Sulphur,Phosphorus.2 \mathrm{Cu}+\mathrm{CO}_2 "Lassaigne's test" is used to detect Nitrogen, Halogen, Sulphur, Phosphorus.4^{th \text{th }}optionisdetectionofcarbon,itisnot"Lassaigne′stest".option is detection of carbon, it is not "Lassaigne's test".
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