Assertion `B_(2)` molecule is diamagnetic
Reasoning The highest occupied molecular orbital is of sigma type .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

D

Explanation

In `B_(2)`, total number of electrons `= 10 B_(2) rarr sigma (1s)^(2) sigma^(**)(1s)^(2) sigma (2s)^(2) sigma^(**)(2s)^(2) sigma (2p_(x))^(1) pi (2p_(y))^(1)` Presence of unpaired electron shows the paramagnetic nature. The highest occupied molecular orbital is of `pi`-type.