NEETChemistryGeneral Organic Chemistry
Match the elements present in an organic compound (List-I) with the specific ionic sodium salts they form in Lassaigne's extract (List-II). List-I (Elements) List-II (Ionic sodium salts) (A) Nitrogen (I) Na ₂ S (B) Sulphur (II) NaSCN (C) Halogen (III) NaCN (D) Nitrogen and Sulphur both (IV) NaX Choose the correct answer from the options given below:
Options
- A(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
- B(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
- C(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
- D(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
Correct answer
C. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Step-by-step solution
In Lassaigne's test, the covalently bonded elements in an organic compound are fused with sodium metal to form water-soluble ionic sodium salts. The specific reactions are: Nitrogen forms sodium cyanide: Na + C + N NaCN Sulphur forms sodium sulphide: 2 Na + S Na ₂ S Halogens form sodium halides: Na + X NaX When both Nitrogen and Sulphur are present, they form sodium thiocyanate: Na + C + N + S NaSCN Therefore, the correct matching is (A)-(III), (B)-(I), (C)-(IV), and (D)-(II). Answer: (A)-(III), (B)-(I), (C)-(IV),