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Q.

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is

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a

N2

b

C2

c

Be2

d

B2

answer is C.

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Detailed Solution

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1. Be2​: valence electrons =4

(σ2s)2(σ∗2s)2

2. B2​: valence electrons =6

(σ2s)2(σ∗2s)2(σ2pz​)2

3.C2​: valence electrons =8

(σ2s)2(σ∗2s)2(σ2pz​)2(π2px​)1(π2py​)1

4. N2​: valence electrons=10

(σ2s)2(σ∗2s)2(σ2pz​)2(π2px​)2(π2py​)2

C2​ has two unpaired electrons, thus its paramagnetic.

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Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is