Supertrick to Find Bond Order | Part -1| Jee Mains, Advance | AIIMS | NEET | BITSAT | REE
ฝัง
- เผยแพร่เมื่อ 13 ต.ค. 2024
- Hello Guys
Once again, we are available with one of the most important topics for jee and Medical.
Shortcut Trick for Bond Order
Bond Order questions are very common in JEE and other entrance exams. In this post, I will share a very useful trick that helps to solve questions based on bond order very quickly. But first…
What is Bond Order?
You know what Bond Order is, don’t you? If you do, skip the following paragraph. If you don’t read the following few lines carefully.
Bond order is a number that tells us how strong the bond between two atoms forming a molecule is. If the bond order is high, the bond is strong and so the molecule is stable. If the bond order is low, the molecule is unstable.
How do we calculate Bond Order?
There are many methods to finding bond order. One of the most famous and most used formulas states:
Bond Order=1/2(Nb-Na)
where, Nb = No. of electrons in Bonding M.O.
and Na = No. of electrons in Anti-Bonding M.O.
This is NOT the best method for finding bond order in questions which are asked in JEE or other entrance exams. Why?
This is NOT the best method for finding bond order in questions which are asked in JEE or other entrance exams. Why?
1. You need to properly find the number of electrons in bonding molecular orbitals and antibonding molecular orbitals.
2. It takes a lot of time
How should you calculate bond order?
With a little memorization and practice, you can find out the bond order of a species just by looking at it. The method that we will be using IS NOT applicable everywhere, but it works in 99% of JEE problems. So, you see the worth in learning it.
This method will work for any species that have between 10 and 18 electrons. Most problems asked in JEE have electrons between 10 and 18, therefore it is very handy.
First, what you need to remember is this: N2 has 14 electrons and its bond order is 3. Every electron added or subtracted to 14, reduces the bond order by 0.5.
For example, if the number of electrons is 15, then the bond order is 3 - 0.5 = 2.5. Done!
Steps:
Just count the total number of electrons and find the difference from 14. Call it ‘n’.
Bond order = 3 - 0.5n
Points to e remember:
Bond order is directly proportional to Bond dissociation energy and stability but inversely proportional to bond length.
We Hope you will enjoy our lecture.
thanks,
team IITian Explains
------------------------------------------------------------------------
like us on our facebook page
/ iitianexplains
--------------------------------------------------------------------------
Our other important videos
Inert pair effect
• Inert Pair Effect | p-...
--------------------------------------------------------------------
Drago rule
• Drago's Rule | Chemica...
----------------------------------------------------------------------------------------
bent Rule
• Bent's Rule | Chemical...
~-~~-~~~-~~-~
Please watch: "Tricks for dpi - ppi Bonding | Explained by IITian | Jee Mains, Advance, BITSAT, NEET & AIIMS"
• Tricks for dpi - ppi B...
~-~~-~~~-~~-~
![โรงเรียนดัดสันดาน นักเรียนเถื่อน..!! [โรงเรียนไดเม่]](http://i.ytimg.com/vi/vRKPeXn4Fl4/mqdefault.jpg)
![[DRIP] ‘CLIK CLAK’ PREVIEW](http://i.ytimg.com/vi/bcxkcOSbpac/mqdefault.jpg)
There is also alternate shortcut for Bond Order, guys you can find bond order of any species having total electrons from 1 to 20,
First of all we classify the molecules or ions into the following four sets based on total number of electrons present in them.
SET 1: Molecules and ions having total no of electrons within the range (1-2):
In such case Bond order = n/2; [Where n = Total no of electrons]
Eg. H2 (Total electrons = 2), Therefore B.O. = n/2 = 2/2 = 1
SET 2: Molecules and ions having total no of electrons within the range (2-6):
In such case Bond order = I 4- n I / 2 ;
where n = Total no of electrons, ‘I I’ indicates Mod function i.e. the value of bond order is always positive]
Eg. Li2+(5electrons) Therefore B.O. = I 4-5 I / 2 = 1/2 = 0.5.
SET 3: Molecules and ions having total no of electrons within the range (6-14):
In such case Bond order = I 8-n I / 2
Eg: CO (Total electrons = 6+8=14), Therefore B.O.= I 8-14 I / 2 = 3
SET 4: Molecules and ions having total no of electrons within the range (14-20):
In such case Bond order = (20-n) / 2 ; [Where n = Total no of electrons]
Eg. NO (Total electrons = 15), Therefore B.O. = 20-15/2 = 2.5
Thanks
Team
IITian explains
B2 is Paramagnetic
+Amanat Raaz
yes,you are right.
B2 is paramagnetic.(Exception 16 and 10 ) are Paramagnetic
Wow it's got
@@rasusworld6369 O2- also paramagnetic
you r not only our teacher, u r our friend , philosopher & guide ....!!! All molded into one person...we'll alwz be grtful of ur support.....thank you so much...!!!!!!!!!
akshita tyagi
We are glad to know that you liked our efforts, Stay tuned with us for more such videos
Team IITian explains.
Are u in class11
At 41:03 B2 should be paramagnetic.
Right
But it has even no. of electrons?
B2 AND O2 ARE EXCEPTION☺️
@@reetichauhan355 is a exception
10 16 32 es are paramagnetic
Very very thank you sir.
First time in my life I enjoyed learning chemistry.
I'm amazed by the vast knowledge you possess and how everything is embedded in your brain
Sir please if possible upload serialwise videos on important chemistry chapters and trust me you will have most subscribers than any chemistry teacher
Sir, your videos are so helpful for me but the formula (3-0.5n) which you gave us for finding bond order is not applicable on H2 { [3-0.5*(14-2)] =(3-0.5*12)= -3 } and if we find bond order by MOT we get 1bond order. Will you please explain me how is this possible?
This trick may be not applicable somewhere but there is another trick which I know that is
No of electrons-2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Bond order----- 1 0.5 0 0.5 1 0.5 0 0.5 1 1.5 2 2.5 3 2.5 2 1.5 1 0.5 0 respectively
Written bond order of total electrons in molecule respectively and in H2 as total electrons are 2 see up for 2 the bond order is 1
Sir, in case of H2, Li2 and B2, number of electron in antibonding molecular orbitals are more in B2 as compared to Li2 . So I think Li2 will be more stable than B2.
Students of modern era needs Supertricks videos. Competition standard is increasing day by day.Make more super-trick videos.Your work is really appreciated @kashif sir .
ChemGuru Publ
Thanks Sir :)))
41:05 Sir B2 is paramagnetic.
In 20:14 Sir in upto 14e electronic configuration there is sigma 2pz not sigma 2py
IITian explains is best Chemistry lecture I have ever seen and sir pls explain about coordination Chemistry also
Sir super dooper lecture sir. Learned lot of things in small time. Thank you so much
Bahut accha tarika padhne ka ... thanks sir
Sir..but why we can't use the formula 3-(0.5n) for He2
As for He n=4 and so B.O= 3-5=-2
Sir at 31:50 you said that stability is proportional to no of elec. In BMO. And inversely to no. Of ele. In ABMO, but here if consider ABMO then boron has 4e- in that and lithium has 2 it is contradicting which one to prefer first.
Sir according to the formula ,b.o.=3-0.5n Li2 has b.o.-1 but according to m.o.t. b.o. is 1.why?
Sir bond order equal 3 -0.5n is applicable to how many electrons. Sir pls
Rply.
Sir please add a video on the acidity and basicity of oxide and hydroxide and their trends in periodic table
Thank you sir mujhe mot samagh me nhi aata tha par aaj aapki vedeo dekhakar bahut kuch samajh me agya 🙏🙏🙏🙏🙏🙏
Sabse pyaari aadat sir ki mujhe vo lagti Hai ki jab starting me vo kehte Hain ki vo detail me nhi jaenge but vo fir bhi core concept padha dete hain😊 I really love that part and watching your video is entertainment. Maza aajata Hai sir.
Sir u are God of chemistry 🙏🙏
sir, I have a doubt that why the shorcut 3-0.5n doesn't work for CO+. By using that we get 2.5 as answer but actually it's B.O is 3.5
Bcoz tht is short trick.. And in science concept works trick doesn't work always... They are man made they can be wrong but concept are natural...
Co+ is an exception it’s bond order is 3.5
Even if calculate from concept it will come out to be 2.5 so some changes are made in MOT in case of CO+
Because it is an exception
@@charusethi5996 yes bro u are right it is an exceprion
... Even in ncert it has been guven clearly
Electronic configuration for co+ is not the same as other
Sir, Jiske BMO me zyada electrons honge uske ABMO me bhi to zyada electrons, to fir stability kiske basis me check kare? BMO ke electrons se ya ABMO ke electrons se
Sir u are really great you are like of Ioc and oc
Arrange in order of stability NO+, CN-,N2
Manas Pratim Biswas
We will try to make a separate lecture on different problems.
😊
your answer is
(Order of Stability in decreasing order)
NO+ > N2 > CN-
Yon can explain it in conceptual way.
Or you can varify this with following.
Also, use data
106 pm for NO+
109 pm for N2
116 pm for CN- (It can vary with connecting group like phenyl or other hetero aromatic species )
Thanks
THANKS
Sir, biggest doubt ever 🤔 at 35:58
BMO of (N2^+ ) < (N2^-). But ABMO OF (N2^+) < (N2^-). It contradicts that stability is is directly proportional to BMO AND inversely proportional to ABMO
PLEASE CLEARE IT🙏🙏🙏🙏🙏
B2 is paramagnetic,, while mka sir according ,it is dia, plz explain
Sir CO2 ka bond order kya he sir ? Aur kese karte he
Sir can u plz explain the bond order technique (or technique for finding bond length, stability etc.) for heteroatomic molecules...
Like C=O, C-C, C=C, C-H
Manas Pratim Biswas
Yup, Sure 😊
Stay tuned with us.
Also, suggest IITian explains to friends and needy students.
We are coming with many such conceptual topic with awesome tricks and techniques.
Team IITian explains.
THANK YOU
B2 is paramagnetic sir.n can u explain the bond order of Co+
Sir my teacher explain if B. O remains same then species having more no. Of antibonding electrons will be less stable according to this Li^2 is more stable than B^2
Sar ne ye ques. Galat kiya?
Just what I wanted.. thank you sir! I used to always draw structures and think how iitians do it in such less time. I dont go to tutions.
Sir can you please upload a video on reactions of grp 16 and 17?
sir why your trick of 3- 0.5n does not work for H2, Li2
Sir aapne hybridization ka video bhi bnaya h kya
op sir thanks bahut help hua
How to calculate bond order of O3
Sir B2 is paramagnetic.
Thanks sir really helped
Sir helium 2+ me b.o. apki trick se negative ata hai but it is exists
in plasma state on high melting point
Li2 me 3-0.5n walla trick applicable nhi ho rha sir.bond order ke liye
36:00
Why didn't you used greater than 15 mot configuration for N_2 ²-
Sir u made a mistake in spectroscopic series in finding Bo. It is sigma 2p z after pi 2px and pi2py
Very very important lecture and very effective thanks sir great lecture 😇😇😇😇😇😇😇
suraj bhandari
Welcome 😊
Stay connected with us for more such videos.
Team
IITian explains
What is the bond order of Ni-co bond in Ni (co) 4
Hello sir ,please explain me the electronic configuration .I am not be able to find out the number of the electrons in the valence shell and outermost electronic configuration
Kindly tell us about the cases in which your formula will not be applicable. Pls this is important. Kindly reply
Sir hats off to your energy...
Dear sir you taught us that B2 is diamagnetic since it has even no of electron but it is wrong
Because it is paramagnetic due to 2 unpaired electron.
Further this question was asked in Jeemains 2017 offline paper.
sir 🤗🤗🤗🤗
Sir.. Pls give video of molecular orbital theory
Sr u r great in teaching
Hello sir ,the trick to find paramagnetism and diamagnetism is not working on the cations and anions .can you help me to find out which of the following is diamegnetic according to your trick
1..Ne2+
2... Be2+
3.. Cl-
4....As+
According to the fact of presence of more electron in abmo that makes it less stable the order should be h2 li2 b2
Sir you are too superb Aapne Jo help kari hai
Sir the formula doesn't works on CO+. Why?. And your work is fully appreciated. Good job 👍🙂
Sir please arrange an lecture of dipole moment bcoz i'm totally confused in it as I studied it from different books and i'm only trust on you
Sir, pleaseeeeeeeeeeeeeeeeeeeee..............................
..........
..
.......
you the best and best ....... love you sir
till now I have not watched such a wonderful video for most difficult topic now your effort made it easy sir thank you sir
sir.. i am really so much impressed by you ...
your way of teaching is a wonder for me...
thank a lot..
How to find B.O.Of Na2S2O3,H4P2O7
Apaki formula me CHARGE ON ACIDIC RADOCAL likh hai.but neutral me kya?
CO,N2O5 me kase?
Kia yi bond order ka formula more than 14 electrons ka lie bii use karsakty hai forexample for chlorine molecule??
Sir aapnai co ka bond order 3 likala tha bt ishka bond order toh 3 nd 3.5 kai bich mai hota hai plz reply
For hydrogen molecule how the supertrick can be implemented??
U r great sir😍
Sir B2 (10e') paramegnetic hota h
10 v exception hota hai
Trick given by during lecture doesnot hold good for H2..... Plz help me i m confused totally
Very nice lecture sir thank you
Sir aapke is trick se co+ ka bond order co ke bond order se km aayega but co ka bond order km hota hai co+ se . Pls explain maine apne coaching ki dpp me galat kr diya ye question .
AK exception hai for co+ it's 3.5
Sir thanks a lot from the bottom of my heart.. Hamein sirf issi tarah ka tricks batayiye sir... Needed badly...
anshuman dash
Stay connected with us, many such videos are on their way.
We hope, you will enjoy it.
Thanks
Team IITian explains
Sir how can I find out the bond order of cl2 or the species having higher no. Of electrons.????
That u will have ro find using concept
Very nice explanation sir
thousands of love to you sir... u r phenomenal
Sir in this video when you were teaching the stability between the compound H2, Li2, B2 .Here you said that more the no of bonding or antibondig orbitals more the stability of that compound.
And in the next minute you taught us stability between the compounds N2, N2+, N2-, N2-- here you said that more the no of bonding or antibonding orbitals less the stability of that compound.
I unable to understand what you want to say . Please tell me which one is correct.
Vinod Kumar
Outstanding supertrick sir... Thank u so much...
Sir please put the video of double movement😚😍
Awesome sir......Really very helpful
Ankur Upadhyay
:)))
We are glad to know that our videos are helpful for your preparation.
Stay tuned with us for more such conceptual and tricks-techniques videos.
Also, Suggest IITian explains to friends and needy students.
Thanks
Team IITian explains.
U are not a teacher .u are like brother
Plz explain this : B2 MO diagram with no sp mixing:
B2 = 6e- = σs(2e-) σs*(2e-) σp(2e-) πp(0e-) πp*(0e-) σp*(0e-)
Predicts B2 will have a diamagnetic ground state as all the electrons are paired
B2 MO diagram with sp mixing (raises energy of σ3> π1) s,p labels changed to numerical labels:
B2 = 6e- = σ1(2e-) σ2 (2e-) π1(2e-) σ3(0e-) π2*(0e-) σ4*(0e-)
π1 is a doubly degenerate MO and so the two e- will occupy these MOs with their spins unpaired and parallel (Hund’s Rule); cf O2. It is predicted to be paramagnetic because of the presence of the two unp e-. The experimental evidence shows that B2 in the gas phase is quite clearly paramagnetic hence in agreement with the latter MO scheme.
Sir but at 36,:09 second in video .
, In N2 plus there is 9 e- in BMO whereas 10 e- in ABMO in N2 minus on that basis stability of N2minus shuold be greater than N2Plus .
Sir can you please make a video on Molecular orbital Theory
Nice but I think u forget a lil of B2 10 es but still paramagnetic .No problem bade sheher main chotu mistakes kabhi kabhi ho jati hain.
Kya bole apke bare me sir your are just amazing extraordinary superb teacher
Very very helpful nice vedio
sir can you upload lectures on resonance, hyperconjugation and gaseous state.
Sayan Ray
Dear, its on the way
Stay connected with us.
Team
IITian explain
Sayan Ray
A full lecture on Hyperconjugation has been uploaded to our channel.
We hope, you will enjoy it.
Thanks
Team
IITian explains
Sir i always love your concept and amazing way of explanation.
Improved mine interest in many topic,thanks!!!
Sir how to find bond order of dihydrogen by supertrick
Sir mzaaa aa gya video dekh kar
B2 is paramagnetic not diamagnetic
But it has even no. of electrons...?
Sr g .. co+ ka to co se jyada sna chahiye... lkin is trick se km a rha hai. Co+ ka 3.5 hota jb ki co ka 3 hota... lkin is trick se co+ ka 2.5 a rha hai. Plzz hlp
sir plzz make videos on mechanism of important organic reactions .. your super tricks are really super cool
If differenc of electrons from 14 e- is greater than 7 then value of B.O comes as -ve????? what to do?? 😧..
Sir B2 ( Dimagnetic) hota hai
very nice explanation sir thanks
sir lithium or hydrogen me aapka wala formula nhi lag rha hai
The best
Sir h2 molecule mein trick apply nahi ho rahi hai
how to find bond length of like BF3 BF4_NF3 NCl3plz answer its urgent
hello sir
sir B2 is paramagnetic
yes/no
please discuss
arvind kumar yes