List of top Chemistry Questions on Spectroscopy

In IR spectroscopy, which bond absorbs at the highest wavenumber?

. Number of different $\text{H}$-atoms in $(\text{Y})$

Given below are two statements:
Statement I: The Balmer spectral line for H atom with lowest energy is located at \( \frac{5}{36} R_H \, \text{cm}^{-1} \).
(\( R_H \) = Rydberg constant)
Statement II: When the temperature of blackbody increases, the maxima of the curve (intensity and wavelength) shifts to shorter wavelength.
In the light of the above statements, choose the correct answer from the options given below:

Number of distinct NMR signals observed in case of acetone and ethyl methyl ketone are:

The structure of the compound having molecular formula $C_9H_{12}$ showing NMR peaks at δ 7.1, 2.2, 1.5 and 0.9 ppm is:

Which of the following vibrational mode shows no IR absorption bands:

Identify the compound in the following list:

The increasing order of number of vibrational degrees of freedom from the following:
(A) \( \text{CO}_2 \)
(B) \( \text{CH}_4 \) 
(C) \( \text{H}_2 \) 
(D) \( \text{C}_2\text{H}_6 \)
follows the order:
Choose the correct answer from the options given below:

The atomic masses of \( ^1H = 1.673 \times 10^{-27} \, \text{kg} \) and \( ^{35}Cl = 58.06 \times 10^{-27} \, \text{kg} \). The reduced mass of HCl is:

The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’, probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are :