Question

Which of the following molecules will not display an infrared spectrum?

• A. CO\(_2\)
• B. N\(_2\)
• C. Benzene
• D. HCCH

Hint:

- Heteronuclear molecules (e.g., CO\(_2\), HCl) show IR activity. - Homonuclear diatomic gases (e.g., N\(_2\), O\(_2\)) do not absorb IR.

Answer 1

The Correct Option is B

Step 1: Understanding infrared activity. 
- A molecule absorbs IR radiation if it has a change in dipole moment. 
- N\(_2\) is non-polar and does not exhibit IR absorption. 
Step 2: Selecting the correct option. 
Since N\(_2\) lacks a dipole moment, the correct answer is (B).