Write two differences between DNA and RNA.

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

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.

(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 Ni_0.98O_1.00. What

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

Calculate the emf of the following cell at 25°C :

Al (s) |Al³⁺ (0.001 M) || (0.1) Ni²⁺ |Ni (s)

Given : E^°_{(Ni2+ /Ni)}= – 0.25 V

E° _{(Al3+ / Al)}=– 1.66 V

[ log 2 = 0.3010, log 3 = 0.4771 ]