Which one of the following reactions does not belong to ''Lassaigne's test''? [2025]

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Q.
Which one of the following reactions does not belong to ''Lassaigne's test'' [2025]

1 $Na + X \underset{Δ}{\to} NaX$

2 $2 CuO + C \underset{Δ}{\to} 2 Cu + {CO}_{2}$

3 $Na + C + N \underset{Δ}{\to} NaCN$

4 $2 Na + S \underset{Δ}{\to} {Na}_{2} S$

Ans.
(2)

$2 CuO + C \overset{Δ}{\to} 2 Cu + {CO}_{2}$

The given reaction is used to detect the presence of carbon in organic compounds. Lassaigne’s test is used to detect nitrogen, sulphur, halogens and phosphorus in organic compounds.

Solution

Q.
Which one of the following reactions does not belong to ''Lassaigne's test'' [2025]

1 $Na + X \underset{Δ}{\to} NaX$

2 $2 CuO + C \underset{Δ}{\to} 2 Cu + {CO}_{2}$

3 $Na + C + N \underset{Δ}{\to} NaCN$

4 $2 Na + S \underset{Δ}{\to} {Na}_{2} S$

Ans.
(2)

$2 CuO + C \overset{Δ}{\to} 2 Cu + {CO}_{2}$

The given reaction is used to detect the presence of carbon in organic compounds. Lassaigne’s test is used to detect nitrogen, sulphur, halogens and phosphorus in organic compounds.

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Solution

Q. Which one of the following reactions does not belong to ''Lassaigne's test'' [2025]

1 Na+X→ΔNaX

2 2CuO+C→Δ2Cu+CO2

3 Na+C+N→ΔNaCN

4 2Na+S→ΔNa2S

Ans. (2) 2CuO+C→Δ2Cu+CO2 The given reaction is used to detect the presence of carbon in organic compounds. Lassaigne’s test is used to detect nitrogen, sulphur, halogens and phosphorus in organic compounds.

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Q.
Which one of the following reactions does not belong to ''Lassaigne's test'' [2025]

1 $Na + X \underset{Δ}{\to} NaX$

2 $2 CuO + C \underset{Δ}{\to} 2 Cu + {CO}_{2}$

3 $Na + C + N \underset{Δ}{\to} NaCN$

4 $2 Na + S \underset{Δ}{\to} {Na}_{2} S$

Ans.
(2)

$2 CuO + C \overset{Δ}{\to} 2 Cu + {CO}_{2}$

The given reaction is used to detect the presence of carbon in organic compounds. Lassaigne’s test is used to detect nitrogen, sulphur, halogens and phosphorus in organic compounds.