Question

*Organic Chem1) Look the electromagnetic waves below and show an increase in the order of their wave lengths. Ultra Voilet (UV),   Infra Red (IR), Visible (VIS), Radio wave (NMR) and Microwave (Rotational)




2) Match each spectroscopic technique with the following properties used molecular characterization.

Properties: Molecular vibrations, Atomic environment, Electronic transition, Molecular weight/Molecular Formula and Polarizability.

NMR Spectroscopy             Mass Spectrometry            IR Spectroscopy                   UV-VIS Spectroscopy          Rotational Spectroscopy

Answer 1

Increasing order of their wave lengths.

Ultra Voilet (UV), Visible (VIS), Infra Red (IR), Microwave (Rotational), Radio wave (NMR)

(shorest wavelength)                                                                         (longest wavelength)

The wavelength increases as we go from left to right in the above series, the frequency decrases in the same order.

2. Molecular Vibration - IR Spectroscopy (vibrational transititions)

   Atomic Environment - NMR Spectroscopy (Nuclear flip transition)

   Electronic transition - UV-VIS Spectroscopy (electronic transition)

   Molecular weight/Molecular Formula - Mass Spectrometry (e/m of the ionised species)

    Polarizability - Rotational Spectroscopy (Rotaional transition)