Question

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]:
Assertion: Draw texturing of isotactic polypropylene (POY) at a relatively high speed is possible despite high crystallinity of the feeder yarn.
Reason: Isotactic polypropylene (POY) has majorly smectic mesomorphic phase.

• A. Both [a] and [r] are true and [r] is the correct reason for [a]
• B. Both [a] and [r] are true but [r] is not the correct reason for [a]
• C. Both [a] and [r] are false
• D. [a] is true but [r] is false

Hint:

When evaluating assertions and reasons, ensure that the reason logically supports the assertion. Both should be checked for scientific accuracy.

Answer 1

The Correct Option is A

The assertion discusses the possibility of drawing isotactic polypropylene (POY) at a relatively high speed despite its high crystallinity. This is true because the isotactic nature of POY allows for faster processing and higher crystallinity without compromising the drawing speed. The reason provided states that POY has a majorly smectic mesomorphic phase, which is also true. The smectic mesomorphic phase facilitates the high-speed drawing of POY because it allows the polymer chains to align easily under stress. Thus, both the assertion and reason are true, and the reason is correctly explaining the assertion. Final Answer: \[ \boxed{\text{(A) Both [a] and [r] are true and [r] is the correct reason for [a]}}. \]