--%>
Assignment Help - homework help

What are diazonium salts?

The diazonium salts are represented by the general formula ArN2 +X where X- ion may be anion such as (Cl) ¨, B ¨r, HSO ¨4, etc. The N+2group is (N+ ≡ N) and is called diazonium group.


They are named by adding the word diazonium to the name of parent aromatic compound to which they are related, followed by the name of anion. Some examples are
1220_diazonium salta.png 


Stability of arenediazonium salts

Arenediazonium salt is relatively more stable than the alkyldiazonium salt. The arenediazonium ion is resonance stabilized as is indicated by the following resonating structures.

No resonance stabilization occurs in alkyl diazonium ion. It is therefore, unstable and immediately loses N2 gas to form relatively more stable alkyl carbonation.
1126_diazonium salts1.png 


The alkyl carbocation can undergo substitution or elimination process under suitable conditions to form different products. It may be noted that even arenediazonium ion is stable only for a short time span in solution of low temperature (273 K - 280 K).

Preparation of arene-diazonium chloride

From 1° Arylamines, it has been pointed out earlier that primary arylamine react with nitrous acid at low temperature (273 - 278 K) to give aromatic diazonium salts. This particular reaction is known as diazotization. Nitrous acids being unstable are processed in situ by the reaction of sodium nitrite and dilute mineral acid.

247_diazonium salts2.png

 

 

 

 

   Related Questions in Chemistry

  • Q : Explain gels and its various categories.

    Certain sols have the property of setting to a semi-solid, jelly-like form by enclosing the entire amount of liquid within itself when they are present at high concentrations. This process is called gelation and colloidal systems with jelly-like appearance are known as gels. Some common examples

    		•
  • Q : Atmospheric pressure Give me answer of

    Give me answer of this question. The atmospheric pressure is sum of the: (a) Pressure of the biomolecules (b) Vapour pressure of atmospheric constituents (c) Vapour pressure of chemicals and vapour pressure of volatile (d) Pressure created on to atmospheric molecules

    		•
  • Q : Pressure Phase Diagrams The occurrence

    The occurrence of different phases of a one component system can be shown on a pressure temperature. The phases present in a one line system at various temperatures can be conveniently presented on a P- versus-T diagram. An example is pro

    		•
  • Q : Molarity of Nacl solution When 5.85 g

    When 5.85 g of NaCl (having molecular weight 58.5) is dissolved in water and the solution is prepared to 0.5 litres, the molarity of the solution is: (i) 0.2 (ii) 0.4 (iii) 1.0 (iv) 0.1

    		•
  • Q : What are heterogenous catalysis? Give

    When the catalyst exists in a different phase than that of reactants, it is said to be heterogeneous catalyst, and the catalysis is called heterogeneous catalysis. For example, SO2 can be oxidized to SO3

    		•
  • Q : Describe the function of the

    Briefly describe the function of the monosaccharide?

    		•
  • Q : Mole fraction of hydrogen Give me

    Give me answer of this question. In a mixture of 1 gm H2 and 8 gm O2 , the mole fraction of hydrogen is: (a) 0.667 (b) 0.5 (c) 0.33 (d) None of these

    		•
  • Q : Problem associated to vapour pressure

    Provide solution of this question. 60 gm of Urea (Mol. wt 60) was dissolved in 9.9 moles, of water. If the vapour pressure of pure water is P0 , the vapour pressure of solution is:(a) 0.10P0 (b) 1.10P0 (c) 0.90P0 (d) 0.99P0

    		•
  • Q : How to establish nomenclature for

    In the common chemistry terminologies, aliphatic halogen derivatives are named as alkyl halides. The words, n-, sec-, tert-, iso-, neo-, and amyl are

    		•
  • Q : Law of vapour pressure Select the right

    Select the right answer of the question. "The relative lowering of the vapour pressure is equal to the mole fraction of the solute." This law is called: (a) Henry's law (b) Raoult's law (c) Ostwald's law (d) Arrhenius's law

    		•