List of top Chemistry Questions on Spectroscopy asked in Common University Entrance Test

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:

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: