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4.Chemical Bonding and Molecular Structure
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Assertion : $B_2$ molecule is diamagnetic.
Reason : The highest occupied molecular orbital is of $\sigma $ type.
A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.
(AIIMS-2005)
Solution
$B_2$ molecule has no of electrons $= 10$
Molecular orbital configuration
$\sigma {\left( {1s} \right)^2}\,{\sigma ^*}{\left( {1s} \right)^2}\,\sigma {\left( {2s} \right)^2}\,{\sigma ^*}{(2s)^2}\,\pi 2p_x^1\,\pi 2p_y^1$
Due to unpaired electron, it is paramagnetic. The highest occupied $MO$ is of $\pi -$ type.
Standard 11
Chemistry
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