Question

In Lassaignes method organic compound is fused with:

• A. sodium metal
• B. zinc dust
• C. sodium caronate and zinc dust
• D. calcium metal

Answer 1

The correct option is A sodium metal

$N,S$ halogens and phosphorus present in an organic compound are detected by Lassaigne test, by fusing the compound with sodium $\left(N_a\right)$ metal, which convents the elements present in the compound from covalent to ionic form.
$Na+C+N\stackrel{\Delta }{\to }NaCN$
$2Na+C+N\stackrel{\Delta }{\to }N{a}_{2}S$
$2Na+X\stackrel{\Delta }{\to }NaX(X=Cl,BrorI)$