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Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is : (A) Be2 (B) B2 (C) C2 (D) N2 Sir, plz explain why (C) is the answer of the above question.

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is :
(A) Be2
(B) B2
(C) C2
(D) N2
Sir, plz explain why (C) is the answer of the above question.

Grade:12

9 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
C is the answer because the electronic configuration of carbon molecule is
@1s2 @*1s2 @2s2 @*2s2 @2pz2 pi2px1 pi2py1

the electrons are unpaired in bonding molecular orbital.
rest in allother molecule the electrons are paired all other are dimagnetic
Gargi
11 Points
8 years ago
What do they mean by 2s-2p mixing . And for number of electrons less that 14 DONOT we fill pi2px and pi2py before @ 2pz?
R R Jakhar Chemistry Faculty at Fiitjee
13 Points
7 years ago
At place of hybridization (in VBT) , Mixing term is used in MOT , it is similar to hybridization . in CO eleron released from sigma 2s* to form CO+ . so bond order in CO+ = 3.5
Sahabudin
56 Points
7 years ago
option c is correct because carbon atom contain unpaired bonding molecules orbital .
where as those molecules whose electron are paired are called as diamegnetic.
if you are not understand this comment then take your ncrt book and read again VBT theory and 
MOT theory then you will understsnd better.
all best for your exam
Rohitashv
12 Points
7 years ago
You are saying wrong. When the number of electrons are less than 14 pi2px and pi2py are filled before @2pz
Washim Akram
32 Points
5 years ago
In case the electron sum is 14 or less .the energy difference between 2s and 2p is less so they tend to overlp. So 2px and 2py fill then 2pz. If we not considered 2s-2p mixing;2pz energy decreases .so 2pz then 2px-2py filled with  electronic. 
Nilesh Dhotre
16 Points
4 years ago
As usual b2 is paramagnetic if they donnot mentioned anything but in given question they mentioned that sp mixing not take place.In this case b2 is diamagnetic and c2 is paramagnetic because in this case although electrons are less than 14 but you have to fill them like they are greater than 14 as molecular orbotal theory.
Ajeet Tiwari
askIITians Faculty 86 Points
3 years ago
Hello Akshi,
C is the answer because the electronic configuration of carbon molecule is
@1s2 @*1s2 @2s2 @*2s2 @2pz2 pi2px1 pi2py1
the electrons are unpaired in bonding molecular orbital. rest in allother molecule the electrons are paired all other are dimagnetic
Thanks
Yash Chourasiya
askIITians Faculty 256 Points
3 years ago
Dear Studnet


C2​: valence electrons=8
(σ2s)2(σ∗2s)2(σ2pz​)2(π2px​)1(π2py​)1
C2​has two unpaired electrons, thus its paramagnetic.

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya

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