E° cell for the given redox reaction is 2.71

Mg(s) + Cu²⁺ (0.01 M) ––– Mg²⁺ (0.001 M) + Cu_(s)

Calculate Ecell for the reaction. Write the direction of flow of current when an external opposite potential applied is

(i) less than 2.71 V and

(ii) greater than 2.71 V

OR

(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO₄ and ZnSO₄ until 2.8 g of

Fe deposited at the cathode of cell X. How long did the current flow ? Calculate the mass of Zn deposited at the cathode of cell Y.

(Molar mass : Fe = 56 g mol^-1 Zn = 65.3 g mol^-1, 1F = 96500 C mol^-1)

(b) In the plot of molar conductivity (^m) vs square root of concentration (c^1/2), following curves are obtained for two electrolytes A and B :

Answer the following :

(i) Predict the nature of electrolytes A and B.

(ii) What happens on extrapolation of ^m to concentration approaching zero for electrolytes A and B?

Complete the following reactions:

OR

Write chemical equations for the following reactions:

(i) Propanone is treated with dilute Ba(OH)₂.

(ii) Acetophenone is treated with Zn(Hg)/Conc. HCl

(iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO₄.

Differentiate between the following:

(i) Amylose and Amylopectin

(ii) Peptide linkage and Glycosidic linkage

(iii) Fibrous proteins and Globular proteins

OR

(i) Straight chain

(ii) Five alcohol groups

(iii) Aldehyde as carbonyl group

(a) How do you convert the following :

(i) Phenol to Anisole

(ii) Ethanol to Propan-2-ol

(b) Write mechanism of the following reaction :

(c) Why phenol undergoes electrophilic substitution more easily than benzene ?

OR

(a) Account for the following :

(i) o-nitrophenol is more steam volatile than p-nitrophenol.

(ii) t-butyl chloride on heating with sodium methoxide gives 2-methylpropene instead of t-butylmethylether.

(b) Write the reaction involved in the following :

(i) Reimer-Tiemann reaction

(ii) Friedal-Crafts Alkylation of Phenol

(c) Give simple chemical test to distinguish between Ethanol and Phenol.

(a) Give reasons for the following :

(i) Sulphur in vapour state shows paramagnetic behaviour.

(ii) N-N bond is weaker than P-P bond.

(iii) Ozone is thermodynamically less stable than oxygen.

(b) Write the name of gas released when Cu is added to

(i) dilute HNO₃ and

(ii) conc. HNO₃

OR

(a) (i) Write the disproportionation reaction of H₃PO₃.

(ii) Draw the structure of XeF_4.

(b) Account for the following :