JEE Main202227 Jul 2022Morning ShiftChemistryPolymersActual
Match List I with List II List-I Polymers List-II Commenrcial names A Phenol-formaldehyde resin I Glyptal B Copolymer of 1 , 3 -butadiene and styrene II Novolac C Polyester of glycol and phthalic acid III Buna- s D Polyester of glycol and terephthalic acid IV Dacron Choose the correct answer from the options given below
Options
- AA - II , B - III , C - IV , D - I
- BA - II , B - III , C - I , D - IV
- CA - II , B - I , C - III , D - IV
- DA - III , B - II , C - IV , D - I
Correct answer
B. A - II , B - III , C - I , D - IV
Step-by-step solution
Novolacs are phenol-formaldehyde resins with a formaldehyde to phenol molar ratio of less than one. The rubber obtained is also called Styrene butadiene rubber (SBR). In Buna-S, Bu stands for butadiene and, Na for sodium and S for styrene. It is vulcanised with sulfur. The rubber is slightly inferior to natural rubber in its physical properties. Glyptal- a polyester is formed by ethylene glycol and phthalic acid by step-growth polymerization. Dacron obtained by condensation polymerisation of ethylene glycol and ter