Reason (R): Natural rubber is mixed with 3 – 5% sulphur and heated at 100 – 150°C causes cross linking of the cis – 1, 4 – polyisoprene chains through disulphide – s – s bonds.
A. Both A and R are correct and R explains A.
B. Both A and R are correct but R does not explain A.
C. A is correct but R is wrong.
D. A is wrong but R is correct.
Answer:A
Reason (R): Natural rubber is mixed with 3 – 5% sulphur and heated at 100 – 150°C causes cross linking of the cis – 1, 4 – polyisoprene chains through disulphide – s – s bonds.
A. Both A and R are correct and R explains A. B. Both A and R are correct but R does not explain A. C. A is correct but R is wrong. D. A is wrong but R is correct.