a. Out of and which one is more reactive towards S_N2 reaction and why?

b. Out of and Which one is more reactive towards nucleophilic substitution reaction and why?

c. Out of and which one is optically active and why?

Write the structures of monomers used to obtain the following polymers:

a. Neoprene

b. PHBV

c. Bakelite

OR

a. Arrange the following polymers in decreasing order of their intermolecular forces :
Bakelite, Polythene, Buna-S, Nylon-6,6

b. Write the monomers of the following polymer :

c. What is the structural difference between high density polythene (HDP) and low density polythene (LDP)?

a. Why are metal hydroxides better alternatives than sodium hydrogencarbonate in antacids?

b. Why is aspirin used in the prevention of heart-attacks?

c. Why antihistamines do not affect the secretion of acid in stomach?

OR

Define the following terms with a suitable example of each :

a. Tranquilizers

b. Antibiotics

c. Non-ionic detergents

What happens when

a. Salicylic acid is treated with (CH₃CO)₂ O/H⁺?

b. Phenol is oxidised with Na₂Cr₂O₇/H⁺?

c. Anisole is treated with CH₃Cl/anhydrous AlCl₃?
Write chemical equation in support of your answer.

a. Give one chemical test as an evidence to show that [Co(NH₃)₅CI]SO₄ and [Co(NH₃)₅(SO₄)]CI are ionisation isomers.

b. [NiCL₄]^2- is paramagnetic while [Ni(CO)₄] is diamagnetic though both are tetrahedral. Why? (Atomic no. of Ni = 28)

c. Write the electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex in the presence of

i. strong field ligand, and

ii. weak field ligand.
(Atomic no. of Fe = 26)