--%>
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 : What are biodegradable polymers?

      These are polymers that can be broken into small segments by enzyme-catalysed reactions. The required enzymes are produced by microorganism. It is a known fact that the carbon-carbon bonds of chain growth polymers are inert to enzyme-catalysed reactions, and hence they are non biod

    		•
  • Q : Problem on decinormal strength Can

    Can someone please help me in getting through this problem. How many grams of dibasic acid (having mol. wt. 200) must be present in 100ml  of its aqueous solution to provide decinormal strength: (i) 1g  (ii)2g  (iii) 10g  (iv) 20g<

    		•
  • Q : Colligative effect Choose the right

    Choose the right answer from following. Which one of the statements written below concerning properties of solutions, explain a colligative effect: (a) Boiling point of pure water decreases by the addition of ethano (b) Vapour pressure of pure water d

    		•
  • Q : Nuclear Magnetic Resonance The nuclear

    The nuclear states produced by a magnetic field are studied in nuclear magnetic resonance spectroscopy.The frequency of the radiation that corresponds to the nuclear magnetic energy level spacings and the weakness of the radiation absorption that must be e

    		•
  • Q : What do you mean by the term dipole

    What do you mean by the term dipole moment? Briefly describe it.

    		•
  • Q : Application of colligative properties

    Choose the right answer from following. Colligative properties are used for the determination of: (a) Molar Mass (b) Equivalent weight (c) Arrangement of molecules (d) Melting point and boiling point (d) Both (a) and (b)  

    		•
  • Q : Organic and inorganic chemistry Write

    Write down a short note on the differences between the organic and inorganic chemistry?

    		•
  • Q : Question based on maximum vapour

    Provide solution of this question. Which has maximum vapour pressure: (a) HI (b) HBr (c) HCl (d) HF

    		•
  • Q : Dissolving Group IV Carbonate Explain

    Explain how dissolving the Group IV carbonate precipitate with 6M CH3COOH, followed by the addition of extra acetic acid.

    		•
  • Q : Explain structure basicity of amines.

    Basic character of amines is related to their structural arrangement. Basic strength of amines depends on the relative ease of formation of the corresponding cation by accepting a proton from the acid. Greater the stability of cation is, more is basic strength of amine.Alkyl a

    		•