Question:

The Lassaignes solution of an organic compound with nitrogen; sulphur and chlorine contains:

Updated On: Aug 15, 2024
  • $ NaCN,N{{a}_{2}}S,NaCl $
  • $ KCN,{{K}_{2}}S,KCl $
  • $ AgCl,NaCN,{{K}_{2}}S $
  • $ NaNC,FeS{{O}_{4}},KCl $
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The Correct Option is A

Solution and Explanation

In Lassaignes solution, If N is present in organic compound, it is present as NaCN in Lassaignes solution. If S is present in organic compound then in Lassaignes solution, it is present as $ \text{N}{{\text{a}}_{\text{2}}}\text{S}\text{.} $ If N and S both are present in organic compound then in Lassaignes solution these are present as $ \text{NaSCN}\text{.} $ If halogens are present in organic compound then in Lassaignes solution. halogens are present as $ \text{NaX} $ (NaCI, NaBr, Nal).
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Concepts Used:

Structure of Organic Compounds

The three structural formulas – complete structure, condensed structure, and bond line structural formulas are explained below:

Complete Structural Formula-

The Lewis dot structure is considered as the complete structural formula. In Lewis structure, the covalent bonds in the compound are denoted by a dash (―). This helps to emphasize the number of bonds formed by the electrons. Every single bond, a double bond, and a triple bond are represented by one dash, double dash, and triple dash respectively. It illustrates every single bond formed between every atom in the compound, thus called complete structural formula.

Condensed Structural Formula-

Since complete structural formula consumes much time and space to represent the structure, we can condense them. This is the condensed structural formula, where replacing some dashes/bonds by a number of identical groups attached to an atom by a subscript.

Bond Line Structural Formula-

A bond lines structural formula is another way of structural representation of organic compounds.  Here, every bond is represented as a line in a zigzag manner. If not specified, every terminal is assumed to be a methyl (-CH3) group.