Q24 of 36 Page 1

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


(i) Difference between Amylose and Amylopecting is as follows:


(ii) The difference between Peptide linkage and Glycosidic Linkage are as follows



(iii) The difference between Fibrous Proteins and Globular Proteins are as follows



OR


(i) Heating with HI, glucose forms n-hexane by reducing the all -OH and -CHO groups, suggesting the the straight chain of glucose molecule.



(ii) On reaction of glucose molecule with acetyl anhydride, glucose pentaacetate is formed, which confirms the presence of five free -OH substituents on glucose molecule.



(iii) On reaction of glucose with Bromine water, which is a good oxidising agent, the -CHO group gets oxidised to carboxylic acid that is gluconic acid. This indicates the presence of aldehydic functional group in glucose molecule.



More from this chapter

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22

An aromatic compound ‘A’ on heating with Br2 and KOH forms a compound ‘B’ of molecular formula C6H7N which on reacting with CHCl3 and alcoholic KOH produces a foul smelling compound ‘C’. Write the structures and IUPAC names of compounds A, B and C.

 23

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.


 25

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 (c1/2), 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?


 26

(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.