MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 2,000 off
USE CODE: chait6

				   Explain the concept of stability of Resonating structures. In detail.

(thanks to MR SHINE for helping me in previous que.)

7 years ago

Share

Answers : (2)

										

In the early days of chemistry when Every scientist was after the compound which today is called the mother compound of the organic chemistry BENZENE...


The fact that benzene has six carbons in its molecule suggested many compoundes with chains. But not one of them suggested the one that we know today. Thats because a six carbon ring is highly concerned about the angle between the bonds. This highly stabilizes or destabilizes a compound..


There were so many structures suggested but no one cud match all the properties untill the one that we today know fiinally proposed..


So this structure brought with it a very strange and a new theory with it called RESONANCE. This effect actually stabilizes a compound to much larger extend than any other effect that you will have to study in your syllabus for JEE. I dont know if holds true after JEE or not but yeah till you give your JEE this is true.


For a compound to be blessed by this effect it has to follow some rules which are:


1. The compund should be planar


2. The copmpund should possess conjugated double or sometimes triple bond(pie electrons to be more general)


3. The conjugated pie electrons should be confined within a cycle


If a compound follows all these rules then and only then it is resonance stabilized, else its not.


Keep in mind the first rule. thats what JEE asks its questions upon if its really about the basics of resonance..


best of luck


 

7 years ago
										

Hi


Resonance energy( Reason for stability)


Resonance hybrids are always more stable than any of the canonical structures would be, if they existed. The delocalization of the electrons lowers the orbital energies, imparting this stability. The resonance in benzene gives rise to the property of aromaticity. The gain in stability of the resonance hybrid over the most stable of the (non-existent) canonical structures is called the resonance energy.


A canonical structure that is lower in energy makes a relatively greater contribution to the resonance hybrid, or the actual picture of the molecule. In fact, resonance energy, and consequently stability, increase with the number of canonical structures possible, especially when these (non-existent) structures are equal in energy.


Resonance energy of a conjugated system can be 'measured' by heat of hydrogenation of the molecule. Consider the example of benzene. The energy required to hydrogenate an isolated π-bond is around 28.6 kcal/mol (120 kJ/mol). Thus, according to the VB picture of benzene (having three π-bonds), the complete hydrogenation of benzene should require 85.8 kcal/mol (360 kJ/mol). However, the experimental heat of hydrogenation of benzene is around 49.8 kcal/mol (210 kJ/mol). The difference of 36 kcal/mol (150 kJ/mol) can be looked upon as a measure of resonance energy. One must bear in mind again that resonance structures have no physical existence. So, even though the term 'resonance energy' is quite meaningless, it offers an insight into how different the VB picture of a molecule is from the actual molecule itself. The resonance energy can be used to calculate electronegativities on the Pauling scale.

7 years ago

Post Your Answer

Other Related Questions on Organic Chemistry

Hi pl tell the best book for organic chemistry for iit preparation of jee mains and jee advanced......its urgent....
 
 
HEY ARYAN YOU CAN REFER TO OP TANDN ORGANIC CHEMISTRY. The latest trends of different competitive examinations have been integrated with the fundamental concepts in the book. Some of the...
 
SAHIL 25 days ago
 
HEY DEAR OK NO PROBLEM YOU CAN REFER LG WADE BOOK ALSO INSTEAD OF OP TANDON. ACTUALLY IF YOU READ LG WADE AND SOLOMONS, YOU WILL COME TO UNDERSTAND THAT IT IS BETTER TO READ FROM LG WADE....
 
SAHIL 24 days ago
 
SORRY DEAR WE CANNOT POST EXTERNAL LINKS AT THIS SITE. MOREOVER THE BOOK IS NOT WITH ME IN ANY FORMAT. OTHERWISE THE BOOK IS GOOD FOR GOC. ALL THE THINGS ARE WELL EXPLAINED. IT WILL SURELY...
 
SAHIL 23 days ago
What are biodegradable and non-biodegradable detergents?
 
 
Biodegradable detergents: Cleansing agents or detergents which are decomposed by microbes are called biodegradable detergents. Their molecules have less branching. Non-biodegradable...
 
SAI SARDAR 6 months ago
 
1. Biodegradable Detergents are those detergents which can be degraded or decomposed by microorganisms present in water.such detergents have straight chain of hydrocarbons in the...
 
somprasad 6 months ago
 
1.Biodegradable dete rgents :Detergents having straight hydrocarbon chains are easily degraded(decomposed) by microorganisms .e.g.sodium lauryl sulphate. 2.Non-biodegradable detergents...
 
xavier 6 months ago
I have op tandon for organic chemistry but my teacher says it`s not that good any idea what r must buy for organic? For problems I have himanshu pandey book
 
 
@ harsha yes ,o.p tandon is not at all required for organic chemistry , beacuse there are many concept which areabove the level of which jee advanced actually tests . so, for that reason o.p...
 
Umakant biswal 4 months ago
 
frst of all gowith ncert , then solve all ques from himanshu pandey , if u are now at class 11 th then go with morrision and boyd , and if on class 12 th , then go with shortcuts for organic...
 
Umakant biswal 4 months ago
 
op tondon is not so good for jee main because its material has lot of time comsuming and it has a higher level book. you can do first ncrt problems then you take any other books for jee...
 
Sahabudin one month ago
the hybridization of phosphorus in PCl 5 (in solid state ) is 1)sp 3 2)sp 3 d 2 3)sp 3 d 4)both 1 and 2
 
 
sp3d is the right answer. In excited state, intermixing of a 3s, three 3p and one 3d orbitals gives five half filled sp 3 d hybrid orbitals, which are arranged in trigonal bipyramidal...
 
dolly bhatia one month ago
 
@ krishna option no 3 turns out to be the correct option , here , the orbitals are filled by electrons of five cl atom . there are 5 p-cl sigma bond , three in one plane and make an angle of...
 
Umakant biswal 3 months ago
 
i hope to no.3 because phosphours atom contain in last subshell is 5 electron and not contain a lone pair and here is 5 chlorine atom .then we add up eletron and we get a 10 and we devided...
 
sahabudin ali 2 months ago
 
It should be option 4 as PCl5 exists in [PCl4]+ and [PCl6]- in solid state....as in first case it is Sp3 and that in second it is Sp3d2
 
10 hours ago
sir iam a iiit students in RAGIV GANDHI UNIVERSITY OF TECHNOLOGIES, there is a semister it infront of me in 10 days.i don’t know any thing about chemistry.it is a ncert syllubus.please send...
 
 
@ badugu they are ncert books topic , i am mentioning some imp chapter name below 1- COORDINATION COMPOUND ( PART 2 CHEMI ) 2- GENERAL PRINCIPLES OF ORGANIC CHEMISTRY ( 11TH 2ND PART ) 3-...
 
Umakant biswal one month ago
 
Dear Vijay, Go through these topics first as atmost importat ones: Aldehyde and Ketones Biomolecules Alcohols and ethers Coordination Compounds Solid states Electrrochemistry Solutions D and...
 
Vikas TU one month ago
 
@ badugu , kindly be specific in asking the ques , earlier u told that u have ncert syllabus , and i have given the chapters from ncert textbooks only . kindly conform which publication u...
 
Umakant biswal one month ago
How many unpaired electrons are present in superoxide ion?
 
 
But the answer is 3.. As in molecular orbital theory the unpaired electrons in oxygen molecule is 2.. It accepts 1 electron to form superoxide ion.. That electron instead of pairing with 2...
 
Suraj Singh 12 days ago
 
And now I am agree with my solution.. You should check it once.... .. And thanq for the concern... .....
 
Suraj Singh 12 days ago
 
It`s unfortunately wrong..................................... ................. NOť less than 100 char
 
Suraj Singh 12 days ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 6,000 off
USE CODE: chait6

Get extra R 2,000 off
USE CODE: chait6

More Questions On Organic Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details