Which of the following statements is incorrect about lassaigne's test?

If nitrogen and sulphur are present along with halogen the extract should first boil with $HN{O}_3$ for detection of halogen

If sodium fusion is carried out with excess of sodium both nitrogen and sulphur are  present in the lassaigne's extract, and it gives blood red colour

Covalent organic compounds are converted into ionic compounds in this test.

N, S and halogens (Except $F_2$ ) are detected by the test.