--%>
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 : Neutralization of benzoic acid Choose

    Choose the right answer from following. How many grams of NaOH will be required to neutralize 12.2 grams of benzoic acid : (a) 40gms (b) 4gms (c)16gms (d)12.2gms

    		•
  • 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 : Value of molar solution Select the

    Select the right answer of the question. Molar solution contains: (a)1000g of solute (b)1000g of solvent (c)1 litre of solvent (d)1 litre of solution

    		•
  • Q : Mole fraction in vapours Choose the

    Choose the right answer from following. If two substances A and B have P0A P0B= 1:2 and have mole fraction in solution 1 : 2 then mole fraction of A in vapours: (a) 0.33 (b) 0.25 (c) 0.52 (d) 0.2

    		•
  • 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 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 : Problem on partial pressure i) Show

    i) Show that the equilibrium constant Kp for the reaction CaCo3(s) ↔ CaO(s) +CO2(g)is about unity (i.e. = 1.0) at 895 °C.ii) If two grams of calcium carbonate are pl

    		•
  • Q : Determining mole fraction of water in

    A mixture has 18 g water and 414 g ethanol. What is the mole fraction of water in mixture (suppose ideal behaviour of mixture): (i) 0.1  (ii) 0.4  (iii) 0.7  (iv) 0.9 Choose the right answer from abo

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

    What do you mean by the term alum? Also illustrate its uses?

    		•
  • Q : Explain Photoelectron Spectroscopy. The

    The energies of both the outer and inner orbitals of atoms and molecules can be determined by photoelectron spectroscopy.Energy changes of the outermost or highest energy electron of molecules were dealt with here in a different passion. The energies of ot

    		•