Q1:

S₁: Metals are today being replaced by polymers in many applications.

P : Above all, they are cheaper and easier to process making them a viable alternative to metals.

Q : Polymers are essentially a long chains of hydrocarbon molecules.

R : Today polymers as strong as metals have been developed.

S : These have replaced the traditional chromium-plated metallic bumpers in cars.

S₆: Many Indian Institutes of science and Technology run special programmes on polymer science.

The Proper sequence should be:

Question

S₁:	Metals are today being replaced by polymers in many applications.
P :	Above all, they are cheaper and easier to process making them a viable alternative to metals.
Q :	Polymers are essentially a long chains of hydrocarbon molecules.
R :	Today polymers as strong as metals have been developed.
S :	These have replaced the traditional chromium-plated metallic bumpers in cars.
S₆:	Many Indian Institutes of science and Technology run special programmes on polymer science.

The Proper sequence should be:

Ordering of Sentences