Identify the correct statements applicable to rotational spectroscopy.
A. It lies in the microwave region
B. The molecules must have permanent dipole moment
C. The selection rule is ΔJ = ±2
D. Only one transition is observed at room temperature.
Choose the correct answer from the options given below:
1
A, B and C only
2
A and D only
3
A and B only
4
B, C and D only