Question

Match the polymers with their characteristic infrared (IR) stretching frequency.

• A. P-4; Q-3; R-2; S-1
• B. P-3; Q-4; R-2; S-1
• C. P-3; Q-4; R-1; S-2
• D. P-3; Q-2; R-4; S-1

Hint:

In IR spectroscopy, characteristic frequencies of polymers correspond to various vibrational modes, such as C–C, C=O, or C–H stretches. These can help identify the polymer type.

Answer 1

The Correct Option is B

In this question, we need to match the polymers with their characteristic IR stretching frequencies. The typical IR stretch frequencies for the given polymers are as follows:
- (P) Polyurethane: The IR stretch frequency for Polyurethane is approximately 2234 cm\(^{-1}\), corresponding to the C=O stretching vibration in the polymer.
- (Q) Polyethylene: Polyethylene typically shows a characteristic IR stretch at around 1151 cm\(^{-1}\), which corresponds to the C–C stretching in the polymer.
- (R) Polysulfone: Polysulfone typically has an IR stretching frequency near 1720 cm\(^{-1}\), corresponding to the C=O stretch.
- (S) Acrylonitrile-butadiene-styrene copolymer: This copolymer typically exhibits an IR stretch around 2914 cm\(^{-1}\), which is associated with the C–H stretching in the polymer.
From this information, the correct match is: P-3 (2234 cm\(^{-1}\)); Q-4 (1151 cm\(^{-1}\)); R-2 (1720 cm\(^{-1}\)); S-1 (2914 cm\(^{-1}\)). Thus, the correct answer is (B).