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  3. Chemistry
  4. Which of the following molecules is paramagnetic?

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Q. Which of the following molecules is paramagnetic?

BHUBHU 2009

Solution:

$B _{3}(10)=\sigma 1 s^{2}, \overset{\star}{\sigma} 1 s^{2}, \sigma 2 s^{2}, \overset{\star}{\sigma} 2 s^{2}, \pi 2 p_{x}^1 \approx \pi 2 p_{y}^1$
Since, two unpaired electrons are present, $ B_{2}$ is paramagnetic.
All other species, due to the absence of unpaired electrons, are diamagnetic.