Question

Which of the following statements are correct?

(i) Chitin, a complex or heteropolysaccharide occurring in exoskeleton consists of NAG. (ii) Glucosamine and N-acetyl glucosamine are modified

sugar.

(iii) Cellulose shows blue colour when treated with I2.

(iv) Starch in plants and glycogen in animals are store houses of energy

(v) Right end of polysaccharide is called reducing end while left end is called non-reducing end.

(A) (i), (ii) and (iii)

(B) (iii), (iv) and (v)

(C) All except (iii)

(D) All except (v)​

Answer 1

Answer:

(C) All except (III)

Explanation:

Cellulose is a derived polysaccharide which is made up of beta-D-glucose units formed by condensation reaction between the glucose molecules and by forming beta 1-4 glycosydic bonds which are linear in structure,so it can't bind with the iodine and no color is observed.

Whereas, starch forms a cage like structure and iodine can bind with it to give a deep blue color, this color change has numerous practical applications and forms the basis of Iodometric titrations.

Rest all options are correct.