Question

Which of the following molecules can absorb in microwave region ? CO or Br2

Answer 1

CO molecule absorbs in the microwave region.

• Only those molecules absorb microwave radiation which have a permanent dipole moment.
• Since there is an electronegativity difference between carbon and oxygen, CO acts as a permanent dipole.
• But, Br₂ has two identical Br atoms with no electronegativity difference.
• Hence, only CO absorbs in microwave region; Br₂ does not.

Answer 2

CO molecules can absorb in ‘microwave region’.

Explanation:  

• Absorption of the energy in microwave region depends on the ability of the compound to generate dipole moment between the atoms.  

• Now in case of $\mathrm{Br}_{2}$ the atoms are similar and they have no electronegativity difference. As a result they cannot absorb in microwave region.  

• On the other hand carbon monoxide, has carbon and oxygen having quite a dipole value due to the difference in the electronegativity.  

• As a result there is some dipole moment. So they can absorb in the ‘microwave region’.

Learn more about microwave region

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