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: Understanding the Concept:
This question tests the fundamental principles behind different spectroscopic techniques. Each technique interacts with or measures a specific molecular or atomic property.
Step 2: Detailed Explanation:
Let's match each spectroscopic technique with the property it is based on:
(A) Raman Spectroscopy: This technique is based on the inelastic scattering of photons, known as Raman scattering. For a vibrational mode to be Raman active, the polarizability of the molecule must change during the vibration. Thus, (A) matches with (I).
(B) FTIR (Fourier-Transform Infrared) Spectroscopy: This is a form of vibrational spectroscopy. For a vibrational mode to be IR active (and thus detectable by FTIR), there must be a change in the molecule's net dipole moment during the vibration. Thus, (B) matches with (II).
(C) UV-Visible Spectroscopy: This technique measures the absorption of ultraviolet or visible light by a substance, which causes electronic transitions between energy levels. The amount of light absorbed at a particular wavelength is reported as absorbance. Thus, (C) matches with (III).
(D) NMR (Nuclear Magnetic Resonance) Spectroscopy: This powerful technique exploits the magnetic properties of atomic nuclei. Nuclei with a non-zero nuclear spin (like \(^1\)H, \(^{13}\)C) can be placed in a magnetic field and absorb radiofrequency radiation at specific frequencies, providing information about the molecular structure. Thus, (D) matches with (IV).
Step 3: Final Answer:
The correct matching is:
(A) \(\rightarrow\) (I)
(B) \(\rightarrow\) (II)
(C) \(\rightarrow\) (III)
(D) \(\rightarrow\) (IV)
This corresponds to option (1).