Q22 of 27 Page 1

(a) What happens when D-glucose is treated with the following reagents: (i) HI (ii) conc. HNO3

(b) What is the basic structural difference between starch and cellulose?


(a) (i)



(ii) Nitric acid oxidizes glucose into saccharic acid.



(b) Starch is made up of -D-glucose units which are held by C1– C4 glycosidic linkage (amylose) or C1–C4 glycosidic linkage whereas branching occurs by C1–C6 glycosidic linkage (amylopectin). Whereas cellulose is made up of -D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit.


More from this chapter

All 27 →
20

(a) How will you convert the following: (i) Phenol to benzoquinone (ii) Propanone to 2-methyl propan-2-ol

(b) Why does propanol have higher boiling point than that of butane?


 21

(a) Identify X and Y in the following:


(b) Amino group is o, p-directing for aromatic electrophilic substitution reactions. Why does aniline on nitration give m-nitroaniline?


 23

(a) Write the names of monomers of following polymer :

(b) What does part 6,6 mean in the polymer Nylon-6,6 ?


(c) Give an example of Biodegradable polymer.


 24

(a) Differentiate between antiseptic and disinfectant. Give one example of each.

(b) Why do we require artificial sweetening agents?


OR


Define the following terms:


(a) Tranquilizers


(b) Ant-acids


(c) Analgesics