4.Chemical Bonding and Molecular Structure
medium

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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