Q11 of 47 Page 1

What happens when D-glucose is treated with the following ? Giveequations to support your answer.

(a) HI


(b) HNO3


OR


Give any two points of difference between globular and fibrous proteins.



(i)Reaction with HI



Here, HI acts as a reducing agent, and n-hexane is formed.


(ii)Reaction with HNO3


Saccharic acid, also known as glucaric acid is obtained when D-glucose is oxidised with nitric acid.


The –CHO and the primary alcoholic groups of glucose get converted to –COOH group.



Note- The secondary alcoholic groups of glucose remain intact and does not oxidised.


OR


Some differences between globular and fibrous proteins are:



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9

How is KMnO4 prepared from pyrolusite ? Give steps involved withequations.

 10

An aromatic compound ‘A’ on treatment with CHCl3 and KOH gives twocompounds, both of which give same product ‘B’ when distilled with Zincdust. Oxidation of ‘B’ gives ‘C’ with molecular formula C7H6O2. Sodiumsalt of ‘C’ on heating with soda lime gives ‘D’ which may also be obtainedby distilling ‘A’ with Zinc dust. Identify ‘A’, ‘B’, ‘C’ and ‘D’.

OR


How do you convert the following :


(a) Phenol to Toluene


(b) Ethanol to Ethanal


 12

Write two differences between DNA and RNA.

 13

(a) Following is the alignment of magnetic moments of a substancewhen placed in a magnetic field. Identify the type of magnetismexhibited by the substance.


(b) Analysis shows that nickel oxide has formula Ni0.98O1.00. What


fractions of nickel exist as Ni+2 and Ni+3 ions ?