Question

Match List-I with List-II 

Choose the correct answer from the options given below: 
 

• 1. (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• 2. (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• 3. (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• 4. (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Create a quick reference table for common spectroscopic methods and their underlying principles. Key associations are: NMR \(\rightarrow\) Nuclear Spin, IR/FTIR \(\rightarrow\) Dipole Moment Change, Raman \(\rightarrow\) Polarizability Change, UV-Vis \(\rightarrow\) Electronic Transitions/Absorbance.

Answer 1

The Correct Option is A

Step 1: Core Idea:
This question assesses understanding of spectroscopic techniques. Each technique probes a specific molecular or atomic characteristic.
Step 2: Breakdown:
Let's link each technique to its underlying property:
(A) Raman Spectroscopy: This technique relies on inelastic photon scattering (Raman scattering). A vibrational mode is Raman active if the molecule's polarizability changes during vibration. Therefore, (A) matches (I).
(B) FTIR (Fourier-Transform Infrared) Spectroscopy: This is vibrational spectroscopy. A vibrational mode is IR active (and detectable by FTIR) if the molecule's dipole moment changes during vibration. Hence, (B) corresponds to (II).
(C) UV-Visible Spectroscopy: This technique measures ultraviolet or visible light absorption, inducing electronic transitions. The absorbed light amount at a given wavelength is reported as absorbance. Thus, (C) links to (III).
(D) NMR (Nuclear Magnetic Resonance) Spectroscopy: This technique exploits nuclear magnetic properties. Nuclei with non-zero nuclear spin (e.g., \(^1\)H, \(^{13}\)C) absorb radiofrequency radiation in a magnetic field, providing structural information. Thus, (D) matches (IV).
Step 3: Answer:
The correct matching is:
(A) \(\rightarrow\) (I)
(B) \(\rightarrow\) (II)
(C) \(\rightarrow\) (III)
(D) \(\rightarrow\) (IV)
This matches option (1).