Give the plausible explanation for the following:
(i) Glucose doesn't give 2,4-DNP test.
(ii) The two strands in DNA are not identical but are complementary
(iii) Starch and cellulose both contain glucose unit as monomer. yet they are structurally different.

Amylose and cellulose are both straight chain polysaccharides containing only D-glucose units. What is the structural difference between the two?

(a) Complete the following chemical equations for reactions : (i) MnO_(4(aq))^(-) + S_(2)O_(3(aq))^(2-) + H_(2)O_((l)) to (ii) Cr_(2)O_(7 (aq))^(2-) + H_(2)S_((g)) + H_((aq))^(+) to (b) Give an explanation for each of the following observations : (i) The gradual decrease in size (actinoid contraction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction.) (ii) The greatest number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbitals configuration (d^(4)) Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent .

Give an explanation for each of the following observations: (i) The gradual decrease in size (actinoid con-traction) from element to element is greater among the actinoids than that among the lanthanoids (lanthanoid contraction). (ii) The greater number of oxidation states are exhibited by the members in the middle of a transition series. (iii) With the same d-orbital (d^4) , Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

(a) Give a possible explaination for each one of the following : - (i) There are two - NH_(2) groups in semicarbazide. However, only one such group is involvedin the formation of semicarbazones. (ii) Cyclohexanone forms cyanohydrin in good yield but 2,4,6 -trimethylcyclohexanone does not. (b) An organic compound with molecular formula C_(9)H_(10)O forms, 2,4 - DNP derivative, reduces Tollens' reagent and undergoes Cannizzaro reaction. On vigorous oxidation it gives 1,2-benzene-di-carboxylic acid. Identify the compound.

Give the equation for the reaction of conc sulphuric acid with - (i) glucose (ii) sucrose (iii) cellulose (iv) an organic acid containing one carbon atom and two hydrogen atoms

The diagram given below shows a section of a human kidney. Study the diagram carefully and answer the questions that follow: (i) Label the parts numbered 1 to 4. (ii) Why does part "2" have a striped appearance? (iii)What is the fluid that passes down part:'4' ? Name the main nitrogenous waste present in it. (iv) Mention the structural and functional unit of kidneys. (v) Name the two major steps in the formation of the fluid mentioned

How many of the following are correct with reference to cellulose? i. It is a polymer of glucose ii. It has branched chains iii. It is a homopolymer iv. It occurs in plant cells v. Cotton fiber and paper contain cellulose vi. Its monomeric unit s N-acetyl glucosamine vii. It gives blue/black colour with iodine

Give the structure of the following compounds : (i) 4-Nitropropiophenone (ii) 2-Hydroxycyclopentanecarbaldehyde (iii) Phenyl acetaldehyde.

Which of the following statements is not true about glucose? (a)It is an aldohexose (b)On heating with HI it forms n-hexane (c)It is present in furanose form (d)It does not give 2,4-DNP test