POLYMERS

ADDITION - HOMOPOLYMERS SNO NAME OF POLYMER MONOMER / STRUCTURE EQUATION POLYMER/STRUCTURE USES

1 POLYTHENE HDP

POLYTHENE LDP

2 PVC

3 TEFLON

4 POLYSTYRENE

5 POLYPROPYLENE

6 POLYACRYLONITRILE

/ORLON/ ACRILAN

7 NATURAL RUBBER

/POLY CIS ISOPRENE

ADDITION - COPOLYMER

SNO NAME OF POLYMER MONOMERS EQUATION POLYMER/STRUCTURE USES

8. BUNA –S 1.

2.

9. BUNA-N 1.

2.

CONDENSATION POLYMERS

SNO NAME OF POLYMER MONOMER / STRUCTURE EQUATION POLYMER/ STRUCTURE USES

POLYAMIDES 1 NYLON 6 6 1.

2.

2 NYLON 6

3 NYLON 2 NYLON 6 1.

2.

POLYESTERS SNO NAME OF POLYMER MONOMER / STRUCTURE EQUATION POLYMER/ STRUCTURE USES

1 TERYLENE 1. 2.

2 GLYPTAL 1. 2.

3 PHBV 1. 2.

RESINS SNO NAME OF POLYMER MONOMER / STRUCTURE EQUATION POLYMER/ STRUCTURE USES

1. BAKELITE 1. 2.

2. MELAMINE 1. 2.

3. UREA FORMALDEHYDE RESIN

1. 2.

HALOALKANES AND HALOARENES PAPER :1 ORGANIC REACTIONS 1

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HALOALKANES AND HALOARENES PAPER 1

ACCOUNT FOR THE FOLLOWING

COMPLETE THE ANSWERS IN THE SPACE PROVIDED

1 Why iodination reactions require an oxidizing agent ?

2 Why is sulphuric acid not used during the reaction of alcohols with KI?

3 For the same alkyl group, the boiling points of alkyl halides decrease in the order: RI> RBr> RCl> RF.

Justify

4 The dipole moment of methyl fluoride is less than methyl chloride even though F is more

electronegative than Cl.

5 The reactions of primary and secondary alcohols with HCl require the presence of a catalyst,

ZnCl2.while tertiary does not

6 The boiling points of chlorides, bromides and iodides are considerably higher than those of the

hydrocarbons of comparable molecular mass. Why?

7 The boiling points of isomeric haloalkanes decrease with increase in branching. Why?

8 Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as

the chief product. Explain.

9 Predict the order of reactivity of the following compounds in S N1 and SN2 reactions:

(i) The four isomeric bromobutanes

(ii) C6H5CH2Br, C6H5CH(C6H5)Br, C6H5CH(CH3)Br ,C6H5C(CH3)( C6H5)Br

10 It is necessary to avoid even traces of moisture from a Grignard reagent

11 Chloroform is stored in closed dark coloured bottles completely filled so that air is kept out.

12 The para-isomers of dihalo arenes are high melting as compared to their ortho and meta-isomers.

13 Although chlorine is an electron withdrawing group, yet it is ortho-para- directing in electrophilic

aromatic substitution reactions. Why?

14 The haloalkanes are only very slightly soluble in water.

15 Allylic and benzylic halides show high reactivity towards the SN1 reaction.

16 Aryl halides are extremely less reactive towards nucleophilic substitution reactions. Why?

17 The electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions

as compared to those in benzene. Why?