(a) Identify the monomer units of

(b) On the basis of forces between their molecules in a polymer, which class do polyvinyls belong to ?

(c) Write the monomers of Terylene.

An organic compound (A) having molecular formula C₆H₆O gives a characteristic colour with aq. FeCl₃ solution. When (A) is treated with CO₂ and NaOH at 400 K under pressure, (B) is obtained. The compound (B) on acidification gives compound (C) which reacts with acetyl chloride to form (D) which is a popular pain killer. Write the structures of A, B, C and D.

Give reasons for the following :

(a) Methyl amine in aqueous solution gives reddish brown precipitate with ferric chloride (FeCl₃).

(b) Ethyl amine is a stronger base than ammonia.

(c) (CH₃)₃C—NH₂ has a lower boiling point than CH₃CH₂CH₂CH₂ — NH₂ although both are isomeric in nature.

(a) Why is it safer to use soaps from the environmental point of view?

(b) What is the basic difference between antiseptics and disinfectants?

(c) Pickles have a long shelf life and do not get spoiled for months. Why?

Sanjay, a peon working in Mr. Pamil’s office, fainted while standing outside his room. Mr. Pamil took him to the nearby hospital where he was diagnosed to be severely 'anaemic’. The doctor prescribed an iron rich diet and multivitamin supplement to him. Mr. Pamil supported his family to get the medicines. After 20 — 25 days he was diagnosed to be normal.

Answer the following questions:

(a) What values (two) are displayed by Mr. Pamil ?

(b) Name the vitamin whose deficiency causes ‘Pernicious

Anaemia'.

(c) Give an example of a water soluble vitamin.

(d) Name two sources of vitamins needed to treat Pernicious Anaemia.