1
Mesomeric effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance | AIPMT
Mesomeric effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance | AIPMT
DATE: 2014/04/03::
2
Resonance
Resonance
DATE: 2010/09/21::
3
Mesomeric effect
Mesomeric effect
DATE: 2012/06/01::
4
Resonance or Mesomeric effect
Resonance or Mesomeric effect
DATE: 2013/05/28::
5
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
DATE: 2012/09/01::
6
What is Mesomeric effect ?
What is Mesomeric effect ?
DATE: 2013/04/25::
7
Lecture Problem: Inductive and Resonance Effects in Acidity
Lecture Problem: Inductive and Resonance Effects in Acidity
DATE: 2012/02/01::
8
Inductive Effect
Inductive Effect
DATE: 2013/05/03::
9
MESOMERIC EFFECT
MESOMERIC EFFECT
DATE: 2012/10/18::
10
The resonance or mesomeric effect on a glassd
The resonance or mesomeric effect on a glassd
DATE: 2013/03/24::
11
Inductive Effect- About Organic Chemistry (Electron Withdrawing Property)
Inductive Effect- About Organic Chemistry (Electron Withdrawing Property)
DATE: 2012/08/02::
12
Mesomeric Effect, Mesomeric Effect Mechanism
Mesomeric Effect, Mesomeric Effect Mechanism
DATE: 2012/08/21::
13
Mesomeric effect - Hyperconjugation Gujarati
Mesomeric effect - Hyperconjugation Gujarati
DATE: 2013/09/06::
14
Resonance Effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance | AIPMT
Resonance Effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance | AIPMT
DATE: 2014/04/02::
15
Resonance Made Easy! Finding the Most Stable Resonance Structure - Organic Chemistry
Resonance Made Easy! Finding the Most Stable Resonance Structure - Organic Chemistry
DATE: 2014/10/05::
16
Application of electronic effect i.e. Resonance, Hyperconjugation & Inductive effect
Application of electronic effect i.e. Resonance, Hyperconjugation & Inductive effect
DATE: 2012/06/03::
17
Paul Nagle - The Mesomeric Effect
Paul Nagle - The Mesomeric Effect
DATE: 2014/12/10::
18
Acids + Bases Made Easy! Part 4 - Resonance
Acids + Bases Made Easy! Part 4 - Resonance's Effect on Acidity/Basicity - Organic Chemistry
DATE: 2013/08/27::
19
- The effect of resonance on rice
- The effect of resonance on rice
DATE: 2013/07/20::
20
Effect of Resonance on Acidity when Ranking Acids and Bases in Organic Chemistry
Effect of Resonance on Acidity when Ranking Acids and Bases in Organic Chemistry
DATE: 2015/02/06::
21
resonance structures II
resonance structures II
DATE: 2012/03/17::
22
Factors that affect acidity (4)  - Resonance
Factors that affect acidity (4) - Resonance
DATE: 2012/07/07::
23
Basic concept of Resonance part 1
Basic concept of Resonance part 1
DATE: 2012/05/31::
24
Resonance Structures of Aniline
Resonance Structures of Aniline
DATE: 2013/04/26::
25
Resonance Lecture 1, Organic Chemistry IIT JEE
Resonance Lecture 1, Organic Chemistry IIT JEE
DATE: 2014/05/12::
26
Chemistry Organic Chemistry Basics part 32 (Resonance energy, features & effect) CBSE class 11 XI
Chemistry Organic Chemistry Basics part 32 (Resonance energy, features & effect) CBSE class 11 XI
DATE: 2013/06/14::
27
Chemistry Organic Chemistry Basics part 31 (Resonance) CBSE class 11 XI
Chemistry Organic Chemistry Basics part 31 (Resonance) CBSE class 11 XI
DATE: 2013/06/14::
28
Inductive Effect - Lecture 1,  Organic Chemistry IIT JEE
Inductive Effect - Lecture 1, Organic Chemistry IIT JEE
DATE: 2014/05/12::
29
General Organic Chemistry Part-4a-Resonance Effect Video Tutorial by C.V. Kalyan Kumar
General Organic Chemistry Part-4a-Resonance Effect Video Tutorial by C.V. Kalyan Kumar
DATE: 2013/08/05::
30
All Organic Substitution reactions by eyes of AKG
All Organic Substitution reactions by eyes of AKG
DATE: 2012/10/23::
31
Organic Tutorial IIT JEE (Solved Problems on Resonance, Inductive effect and Hyperconjugation)
Organic Tutorial IIT JEE (Solved Problems on Resonance, Inductive effect and Hyperconjugation)
DATE: 2014/05/12::
32
IIT Organic Chemsitry,Isomerism In Organic Compounds
IIT Organic Chemsitry,Isomerism In Organic Compounds
DATE: 2014/04/15::
33
General Organic Chemistry-Part 4b-Resonance Effect-Basic Movement of Electrons
General Organic Chemistry-Part 4b-Resonance Effect-Basic Movement of Electrons
DATE: 2013/08/06::
34
Factors That Affect pKa Resonance Organic Chemistry
Factors That Affect pKa Resonance Organic Chemistry
DATE: 2014/01/22::
35
pKa part 5   Inductive Effects
pKa part 5 Inductive Effects
DATE: 2013/02/10::
36
Resonance Effect
Resonance Effect
DATE: 2011/02/10::
37
Chemistry: Resonance Effects
Chemistry: Resonance Effects
DATE: 2011/02/17::
38
Effect Of Substituents On reactivity Of Benzene Ring
Effect Of Substituents On reactivity Of Benzene Ring
DATE: 2013/02/19::
39
Chemistry Organic Chemistry Basics part 32 Resonance energy, features and effect CBSE class 11 XI
Chemistry Organic Chemistry Basics part 32 Resonance energy, features and effect CBSE class 11 XI
DATE: 2014/10/21::
40
Acids + Bases Made Easy! Part 2 - Inductive or Electronegative Effect on Acidity - Organic Chemistry
Acids + Bases Made Easy! Part 2 - Inductive or Electronegative Effect on Acidity - Organic Chemistry
DATE: 2013/07/10::
41
Resonance Effect
Resonance Effect
DATE: 2014/05/09::
42
Resonance Effect
Resonance Effect
DATE: 2011/02/27::
43
Resonance Structure,Positive Resonance Effect (+R effect),Negative Resonance Effect (- R effect)
Resonance Structure,Positive Resonance Effect (+R effect),Negative Resonance Effect (- R effect)
DATE: 2015/02/08::
44
Ajnish Rule and its application in organic chemistry
Ajnish Rule and its application in organic chemistry
DATE: 2012/05/22::
45
Electronic effects in Organic Chemistry by AKG
Electronic effects in Organic Chemistry by AKG
DATE: 2011/12/11::
46
Chemistry Organic Chemistry Basics part 28 Inductive effect CBSE class 11 XI
Chemistry Organic Chemistry Basics part 28 Inductive effect CBSE class 11 XI
DATE: 2014/03/16::
47
What does resonance effect mean?
What does resonance effect mean?
DATE: 2015/03/24::
48
Resonance Structure of benzene,+E Electromeric ,-E Electromeric Effect,Hyperconjugation
Resonance Structure of benzene,+E Electromeric ,-E Electromeric Effect,Hyperconjugation
DATE: 2015/02/11::
49
Mesomeric - Ich vergesse all die Zeit
Mesomeric - Ich vergesse all die Zeit
DATE: 2013/08/03::
50
Inductive Effect on Acidity in Organic Chemistry Vid 6
Inductive Effect on Acidity in Organic Chemistry Vid 6
DATE: 2015/02/19::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
Jump to: navigation, search
+M effect of a methoxy group in an ether
–M effect of a carbonyl group in acrolein

The mesomeric effect or resonance effect in chemistry is a property of substituents or functional groups in a chemical compound. The effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevant resonance structures and is symbolized by the letter M. The mesomeric effect is negative (-M) when the substituent is an electron-withdrawing group and the effect is positive (+M) when based on resonance and the substituent is an electron releasing group.

The net electron flow from or to the substituent is determined also by the inductive effect. The mesomeric effect as a result of p-orbital overlap (resonance) has absolutely no effect on this inductive effect, as the inductive effect is purely to do with the electronegativity of the atoms and their topology in the molecule (which atoms are connected to which).

The concepts of mesomeric effect, mesomerism and mesomer were introduced by Ingold in 1938 as an alternative to the Pauling's synonymous concept of resonance.[1] "Mesomerism" in this context is often encountered in German and French literature but in English literature the term "resonance" dominates.

Mesomerism in conjugated systems[edit]

Mesomeric effect can be transmitted along any number of carbon atoms in a conjugated system. This accounts for the resonance stabilization of the molecule due to delocalization of charge. It is important to note that the energy of the actual structure of the molecule, i.e. the resonance hybrid, may be lower than that of any of the contributing resonance structures. The difference in energy between the actual structure and the most stable of the resonance structures is called the resonance energy or resonance stabilisation energy. Mesomeric effect is completely different from inductive effect.

See also[edit]

References[edit]

  1. ^ Kerber, Robert C. (2006-02-01). "If It's Resonance, What Is Resonating?". J. Chem. Educ. 83 (2): 223. doi:10.1021/ed083p223. 

External links[edit]

Wikipedia content is licensed under the GFDL License
Powered by YouTube
MASHPEDIA
LEGAL
  • Mashpedia © 2015