Write structures of compounds A and B in each of the following

reactions:

a.

b.

Write anode and cathode reactions that occur in dry cell. How does a dry cell differ from a mercury cell?

Account for the following:

a. Gabriel phthalimide synthesis is not preferred for preparing aromatic primary amines.

b. On reaction with benzene sulphonyl chloride, primary amine yields product soluble in alkali whereas secondary amine yields product insoluble in alkali.

a. Following reaction takes place in the cell: Zn(s)+Ag2O(s)+H2O(l)⟶Zn2+(aq)+2Ag(s)+2OH−(aq) Calculate ΔrG0 of the reaction.
[Given: E0(Zn2+/Zn)=−0⋅76VE0(Ag+/Ag)=0⋅80V,1F=96,500Cmol−1J]

b. How can you determine limiting molar conductivity, (∧⁰m) for strong electrolyte and weak electrolyte?

Define the following with a suitable example, of each:

a. Coagulation

b. Multimolecular colloid

c. Gel

OR

a. Out of starch and ferric hydroxide sol, which one can easily be coagulated and why?

b. What is observed when an emulsion is centrifuged?

c. What is the role of promoters and poisons in catalysis?