Play Video
1
Mesomeric effect
Mesomeric effect
::2012/06/01::
Play Video
2
Resonance or Mesomeric effect
Resonance or Mesomeric effect
::2013/05/28::
Play Video
3
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
::2012/09/01::
Play Video
4
Lecture Problem: Inductive and Resonance Effects in Acidity
Lecture Problem: Inductive and Resonance Effects in Acidity
::2012/02/01::
Play Video
5
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
::2014/04/03::
Play Video
6
What is Mesomeric effect ?
What is Mesomeric effect ?
::2013/04/25::
Play Video
7
MESOMERIC EFFECT
MESOMERIC EFFECT
::2012/10/18::
Play Video
8
Inductive Effect
Inductive Effect
::2013/05/03::
Play Video
9
The resonance or mesomeric effect on a glassd
The resonance or mesomeric effect on a glassd
::2013/03/24::
Play Video
10
Mesomeric Effect, Mesomeric Effect Mechanism
Mesomeric Effect, Mesomeric Effect Mechanism
::2012/08/21::
Play Video
11
Mesomeric effect - Hyperconjugation Gujarati
Mesomeric effect - Hyperconjugation Gujarati
::2013/09/06::
Play Video
12
Chemistry: Inductive Effects
Chemistry: Inductive Effects
::2011/02/17::
Play Video
13
inductive effect part II
inductive effect part II
::2012/12/01::
Play Video
14
GPC 1 41    Electronic Effects   Hypercojugation  Lecture
GPC 1 41 Electronic Effects Hypercojugation Lecture
::2012/10/26::
Play Video
15
Relative acidity of o-,m- and p-nitrophenol.mp4
Relative acidity of o-,m- and p-nitrophenol.mp4
::2010/05/09::
Play Video
16
Tricks & Tech. to solve the problems PART-I
Tricks & Tech. to solve the problems PART-I
::2013/07/22::
Play Video
17
resonance
resonance
::2008/04/06::
Play Video
18
Inductive Effect- About Organic Chemistry (Electron Withdrawing Property)
Inductive Effect- About Organic Chemistry (Electron Withdrawing Property)
::2012/08/02::
Play Video
19
JEE( Main) CHEMISTRY (VOLUME-1)
JEE( Main) CHEMISTRY (VOLUME-1)
::2014/02/07::
Play Video
20
Substituent Effects
Substituent Effects
::2008/02/27::
Play Video
21
Chemistry Organic Chemistry Basics part 28 (Inductive effect) CBSE class 11 XI
Chemistry Organic Chemistry Basics part 28 (Inductive effect) CBSE class 11 XI
::2013/06/14::
Play Video
22
Branched Chain Alkanes
Branched Chain Alkanes
::2010/05/25::
Play Video
23
Resonance
Resonance
::2013/11/22::
Play Video
24
Organic Chemistry Video #8: Resonance - Example 5 Carboxylic Acids Part A
Organic Chemistry Video #8: Resonance - Example 5 Carboxylic Acids Part A
::2012/09/11::
Play Video
25
All Organic Substitution reactions by eyes of AKG
All Organic Substitution reactions by eyes of AKG
::2012/10/23::
Play Video
26
SPECIAL REACTIONS OF AROMATIC ALDEHYDE AND KETONES P1
SPECIAL REACTIONS OF AROMATIC ALDEHYDE AND KETONES P1
::2012/10/19::
Play Video
27
REACTION WITH FORMALDEHYDE
REACTION WITH FORMALDEHYDE
::2012/10/18::
Play Video
28
Basic concept of Resonance part 1
Basic concept of Resonance part 1
::2012/05/31::
Play Video
29
Drawing Branched Chain Alkanes
Drawing Branched Chain Alkanes
::2010/01/04::
Play Video
30
RESONANCE HYBRID
RESONANCE HYBRID
::2012/10/18::
Play Video
31
Unit5.5-Nucleophillic Substitution
Unit5.5-Nucleophillic Substitution
::2013/12/05::
Play Video
32
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
::2014/04/02::
Play Video
33
Concept Electromeric Effect 11th Class Organic Chemistry
Concept Electromeric Effect 11th Class Organic Chemistry
::2013/03/26::
Play Video
34
Inductive Effect Part-2 for XI | XII | JEE-Main | JEE-Advance | AIPMT
Inductive Effect Part-2 for XI | XII | JEE-Main | JEE-Advance | AIPMT
::2014/04/02::
Play Video
35
IIT JEE INDUCTIVE EFFECT AND RESONANCE
IIT JEE INDUCTIVE EFFECT AND RESONANCE
::2013/09/20::
Play Video
36
Chemistry Semester 1 Ch 01
Chemistry Semester 1 Ch 01
::2013/09/06::
Play Video
37
REACTION WITH AMMONIA
REACTION WITH AMMONIA
::2012/10/18::
Play Video
38
Periodic Trends Pt5- Inert Pair Effect: Chapter 2
Periodic Trends Pt5- Inert Pair Effect: Chapter 2
::2013/09/03::
Play Video
39
Polymer Gujarati
Polymer Gujarati
::2013/09/06::
Play Video
40
photosynthesis - gujarati
photosynthesis - gujarati
::2013/09/14::
Play Video
41
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
::2013/08/05::
Play Video
42
Electromeric Effect, E Effect, Electromeric Effect Mechanism, Concept of Electromeric Effect
Electromeric Effect, E Effect, Electromeric Effect Mechanism, Concept of Electromeric Effect
::2012/08/20::
Play Video
43
General Organic Chemistry-Part-2-Inductive Effect Video Tutorial by C.V. Kalyan Kumar
General Organic Chemistry-Part-2-Inductive Effect Video Tutorial by C.V. Kalyan Kumar
::2013/08/02::
Play Video
44
Application of electronic effect i.e. Resonance, Hyperconjugation & Inductive effect
Application of electronic effect i.e. Resonance, Hyperconjugation & Inductive effect
::2012/06/03::
Play Video
45
IIT JEE main&advanced (Chemistry)-Electronic Effect & POC (Hindi) by VKP Sir-etoosindia.com-5298
IIT JEE main&advanced (Chemistry)-Electronic Effect & POC (Hindi) by VKP Sir-etoosindia.com-5298
::2013/08/21::
Play Video
46
Finding Subshell and electrons for Class-XI | Class XII | JEE-Main | JEE-Advance | AIPMT
Finding Subshell and electrons for Class-XI | Class XII | JEE-Main | JEE-Advance | AIPMT
::2014/04/03::
Play Video
47
Acids + Bases Made Easy! Part 4 - Resonance
Acids + Bases Made Easy! Part 4 - Resonance's Effect on Acidity/Basicity - Organic Chemistry
::2013/08/27::
Play Video
48
Tellen
Tellen
::2012/10/14::
Play Video
49
IIT JEE main&advanced (Chemistry)-Electronic Effect & POC (English) by VKP Sir-etoosindia.com-5363
IIT JEE main&advanced (Chemistry)-Electronic Effect & POC (English) by VKP Sir-etoosindia.com-5363
::2013/08/21::
Play Video
50
Organic Hybridization for Class-XI | Class-XII | JEE-Main | JEE-Advance | AIPMT
Organic Hybridization for Class-XI | Class-XII | JEE-Main | JEE-Advance | AIPMT
::2014/04/04::
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 may noted that the energy of the actual structure of the molecule i.e. resonance hybrid is lower than that of any of the resonating structures. The difference in energy between the actual structure and the most stable of the resonating structure is called resonance energy or resonance stabilisation energy.

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. 

External links[edit]

Wikipedia content is licensed under the GFDL License

Mashpedia enables any individual or company to promote their own Youtube-hosted videos or Youtube Channels, offering a simple and effective plan to get them in front of our engaged audience.

Want to learn more? Please contact us at: hello@mashpedia.com

Powered by YouTube
LEGAL
  • Mashpedia © 2014