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Mesomeric effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance
Mesomeric effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance
Published: 2014/04/03
Channel: Er Dushyant Kumar-B.tech,IIT Roorkee
Super trick for Mesomeric effect ( +M and -M) - By Vineet Khatri
Super trick for Mesomeric effect ( +M and -M) - By Vineet Khatri
Published: 2016/06/17
Channel: Any Time Padhai Academy
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Mesomeric Effect - Reaction Mechanisms
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Channel: tick Links
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Resonance
Published: 2010/09/21
Channel: Khan Academy
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Mesomeric effect and resonance - General Organic Chemistry part 40
Published: 2017/05/18
Channel: Education and Career Videos
Paul Nagle - The Mesomeric Effect
Paul Nagle - The Mesomeric Effect
Published: 2014/12/10
Channel: Rusting Shells
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The resonance or mesomeric effect on a glass
Published: 2015/11/16
Channel: Helena Malashevych
mesomeric effect 1(organic chemistry)
mesomeric effect 1(organic chemistry)
Published: 2016/12/25
Channel: Kattamuri TOT-The Online Tutor
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Resonance or Mesomeric effect
Published: 2016/03/15
Channel: ToP SeRiES
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Channel: Abdalla ELnagar
Inductive Effect Vs. Mesomeric Effect (Arabic)
Inductive Effect Vs. Mesomeric Effect (Arabic)
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Channel: MOR Education Team
Basic Principle of Organic Chemistry - Application of Mesomeric Effect - Problem Solving
Basic Principle of Organic Chemistry - Application of Mesomeric Effect - Problem Solving
Published: 2016/05/16
Channel: Plancess
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 1)
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 1)
Published: 2016/12/14
Channel: jeechemistry
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Published: 2013/04/25
Channel: rich TV
Mesomeric effect 1 (for iit students) BY R. K. Bhardwaj
Mesomeric effect 1 (for iit students) BY R. K. Bhardwaj
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Channel: kalu das
GOC (Part 2): Mesomeric Effects and Resonance
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Published: 2017/05/26
Channel: Sachin Rana - IIT Bombay
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Published: 2014/02/14
Channel: bhaskar sharma
Resonance , Mesomeric effect , Organic chemistry for JEE ,NEET, class XII & XI Exams Preparations
Resonance , Mesomeric effect , Organic chemistry for JEE ,NEET, class XII & XI Exams Preparations
Published: 2017/02/06
Channel: Pradeep Sharma
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Published: 2015/04/22
Channel: SDictionary
11. Type of Mesomeric Effect-Positive Mesomeric Effect(+M ) and Negative Mesomeric Effect(-M)
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Published: 2016/09/20
Channel: jeechemistry
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Channel: AK LECTURES
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Published: 2016/11/04
Channel: Chemistry Class XI
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Published: 2012/09/01
Channel: Silly Learner
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Published: 2017/01/17
Channel: Vidya-mitra
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Channel: vedupro
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Published: 2015/08/30
Channel: A - Z Chemistry
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Published: 2016/12/14
Channel: jeechemistry
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Channel: iProfIndia
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Channel: aarel videos
Resonance Effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance
Resonance Effect Part-1_Gen. Organic Chemistry for XI | XII | JEE-Main | JEE-Advance
Published: 2014/04/02
Channel: Er Dushyant Kumar-B.tech,IIT Roorkee
Mesomeric effect 2 (for iit students) BY R. K. Bhardwaj
Mesomeric effect 2 (for iit students) BY R. K. Bhardwaj
Published: 2015/08/17
Channel: kalu das
Mesomeric effect 3 (for iit students) BY R. K. Bhardwaj
Mesomeric effect 3 (for iit students) BY R. K. Bhardwaj
Published: 2015/08/17
Channel: kalu das
Mesomeric Effect for NEET, IIT-ADVANCE LEVEL.
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Published: 2017/07/19
Channel: CHANAKYA CHANNEL (JEE MAIN+IIT ADVANCE)
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Channel: JITESH SRIVASTAVA
mesomeric effect 3
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Published: 2016/12/25
Channel: Kattamuri TOT-The Online Tutor
mesomeric effect 2(organic chemistry)
mesomeric effect 2(organic chemistry)
Published: 2016/12/25
Channel: Kattamuri TOT-The Online Tutor
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Published: 2017/07/06
Channel: ChemistryConcept
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Published: 2016/04/07
Channel: Nur Hidayati Noorshamsudin
Inductive Effect - Introduction and Applications
Inductive Effect - Introduction and Applications
Published: 2017/01/06
Channel: Busting JEE Main
Inductive Effect - Reaction Mechanisms
Inductive Effect - Reaction Mechanisms
Published: 2015/11/16
Channel: tick Links
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 2)
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 2)
Published: 2016/12/14
Channel: jeechemistry
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 3)
Mesomeric Effect Introduction and Positive , Negative Mesomeric Effect (Part 3)
Published: 2016/12/14
Channel: jeechemistry
Awesome Concept of Inductive effect ( +I and - I) - By Vineet Khatri
Awesome Concept of Inductive effect ( +I and - I) - By Vineet Khatri
Published: 2016/06/14
Channel: Any Time Padhai Academy
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WIKIPEDIA ARTICLE

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+M effect of a methoxy group in an ether
–M effect of a carbonyl group in acrolein

The mesomeric 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 the substituent is an electron releasing group.

+M EFFECT ORDER

- O > -NH2 > -NHR > -OR > -NHCOR > -OCOR > -Ph > -F > -Cl > -Br > -I

-M EFFECT ORDER

-NO2 > -CN > -CHO > -C=O > -COOCOR > -COOR > -COOH > -CONH2 > -COO

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 has 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 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" dominate

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 inductive structure and the worst kinetic structure 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. Archived from the original on 2006-10-04. 

External links[edit]

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