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Question

Chemistry Question on Chemical bonding and molecular structure

Which one of the following molecules is paramagnetic ?

A

N2N_2

B

NONO

C

COCO

D

O3O_3

Answer

NONO

Explanation

Solution

The molecular orbital configuration of the molecules given is Total no. of electrons in NO.
=7(N)+8(0)=15= 7(N)+8(0)=15
Hence E.C. of NO
=K[σ(2s)]2[σ(2s)]2[σ2pz]2=K\left[\sigma\left(2s\right)\right]^{2} \left[\sigma^{ *} \left(2s\right)\right]^{2} \left[\sigma2p_{z}\right]^{2}
[π(2px)]2[π(2py)]2[π(2px)]1\left[\pi\left(2p_{x}\right)\right]^{2} \left[\pi\left(2p_{y}\right)\right]^{2} \left[\pi^{ *} \left(2 p_{x}\right)\right]^{1}
Due to presence of one unpaired electron NO is paramagnetic Except NO all are diamagnetic due to absence of unpaired electrons.

So, the correct option is (B): NONO.