Which of the following molecules will not display an infrared spectrum?
Show Hint
- CO\(_2\)
- N\(_2\)
- Benzene
- HCCH
The Correct Option is B
Solution and Explanation
Step 1: Understanding infrared activity.
- A molecule absorbs IR radiation if it has a change in dipole moment.
- N\(_2\) is non-polar and does not exhibit IR absorption.
Step 2: Selecting the correct option.
Since N\(_2\) lacks a dipole moment, the correct answer is (B).
Top Questions on Spectroscopy
The UV-visible spectrum of [Ni(en)\(_3\)]\(^{2+}\) (en = ethylenediamine) shows absorbance maxima at 11200 cm\(^{-1}\), 18350 cm\(^{-1}\), and 29000 cm\(^{-1}\).
[Given: Atomic number of Ni = 28] The correct match(es) between absorbance maximum and electronic transition is/are
- GATE CY - 2025
- Chemistry
- Spectroscopy
Compound K displayed a strong band at 1680 cm−1 in its IR spectrum. Its 1H-NMR spectral data are as follows:
δ (ppm):
7.30 (d, J = 7.2 Hz, 2H)
6.80 (d, J = 7.2 Hz, 2H)
3.80 (septet, J = 7.0 Hz, 1H)
2.20 (s, 3H)
1.90 (d, J = 7.0 Hz, 6H)The correct structure of compound K is:
- GATE CY - 2025
- Chemistry
- Spectroscopy
The 1H NMR spectrum of the given iridium complex at room temperature gave a single signal at 2.6 ppm, and its 31P NMR spectrum gave a single signal at 23.0 ppm. When the spectra were recorded at lower temperatures, both these signals split into a complex pattern. The intra-molecular dynamic processes shown by this molecule are:
- GATE CY - 2025
- Chemistry
- Spectroscopy
- The total number of hyperfine lines expected in the EPR spectrum of •CH2OH (radical) is ___________ (in integer).
- GATE CY - 2025
- Chemistry
- Spectroscopy
- Compound(s) that show(s) an intense peak at \( m/z = 120 \) in the EI mass spectrum is/are:
- GATE CY - 2025
- Chemistry
- Spectroscopy
Questions Asked in TANCET exam
- A train moving at 108 km/hr crosses a platform in 30 seconds. Then it crosses a man running at 12 km/hr in the same direction in 9 seconds. What is the length of train and platform in m?
- TANCET - 2024
- Time Speed and Distance
- What letter replaces the question mark?
- The speed of a motor boat in still water is 7km/hr. If the speed of the motor boat against the stream is 5 km/hr, what is the speed of the stream?
- TANCET - 2024
- Time Speed and Distance
A closed-loop system has the characteristic equation given by: $ s^3 + k s^2 + (k+2) s + 3 = 0 $.
For the system to be stable, the value of $ k $ is:- TANCET - 2024
- Microprocessors
A digital filter with impulse response $ h[n] = 2^n u[n] $ will have a transfer function with a region of convergence.
- TANCET - 2024
- Digital Signal Processing