Given below are two statements : Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. In the light of the above statements, choose the correct anower from the options given below :

The qualitative detection of extra-elements (nitrogen, sulphur, halogen and phosphorus) in an organic compound is carried out with the help of Lassaigne’s test, also called the sodium-fusion test.

Case 1 : Statement (I)
Statement (I) says that nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne’s test. During the test the compound is fused with metallic sodium. The fusion converts the covalently bound elements into ionic salts such as $$NaCN$$, $$Na_2S$$, $$NaX$$ (where $$X = Cl, Br, I$$) and $$Na_3PO_4$$, which can then be identified by suitable confirmatory tests. Hence Statement (I) is correct.

Case 2 : Statement (II)
Statement (II) claims that the elements are converted from covalent form into ionic form by fusing the compound with magnesium in Lassaigne’s test. However, the metal actually used in Lassaigne’s test is sodium, not magnesium. Therefore the statement describing fusion with magnesium is incorrect. Hence Statement (II) is false.

Thus Statement (I) is true while Statement (II) is false. The option that matches this combination is Option D.

Final answer : Option D