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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
Mesomeric effect
Mesomeric effect
Published: 2012/06/01
Channel: Ajnish Gupta
Mesomeric effect and resonance - General Organic Chemistry part 40
Mesomeric effect and resonance - General Organic Chemistry part 40
Published: 2017/05/18
Channel: Education and Career Videos
Resonance or Mesomeric effect
Resonance or Mesomeric effect
Published: 2013/05/28
Channel: Soumitra Das
Mesomeric Effect - Reaction Mechanisms
Mesomeric Effect - Reaction Mechanisms
Published: 2015/11/16
Channel: tick Links
Resonance Effect vs Inductive Effect
Resonance Effect vs Inductive Effect
Published: 2015/11/29
Channel: The Organic Chemistry Tutor
Resonance
Resonance
Published: 2010/09/21
Channel: Khan Academy
Mesomeric effect resonance 2.5
Mesomeric effect resonance 2.5
Published: 2017/08/29
Channel: Chemistry class
The resonance or mesomeric effect on a glass
The resonance or mesomeric effect on a glass
Published: 2016/09/26
Channel: Helena Malashevych
Resonance or Mesomeric effect
Resonance or Mesomeric effect
Published: 2016/03/15
Channel: ToP SeRiES
11. Type of Mesomeric Effect-Positive Mesomeric Effect(+M ) and Negative Mesomeric Effect(-M)
11. Type of Mesomeric Effect-Positive Mesomeric Effect(+M ) and Negative Mesomeric Effect(-M)
Published: 2016/09/20
Channel: jeechemistry
GOC (Part 2): Mesomeric Effects and Resonance
GOC (Part 2): Mesomeric Effects and Resonance
Published: 2017/05/26
Channel: Sachin Rana - IIT Bombay
Mesomeric effect Meaning
Mesomeric effect Meaning
Published: 2015/04/22
Channel: SDictionary
Inductive Effect Vs. Mesomeric Effect (Arabic)
Inductive Effect Vs. Mesomeric Effect (Arabic)
Published: 2016/11/12
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 1(organic chemistry)
mesomeric effect 1(organic chemistry)
Published: 2016/12/25
Channel: Kattamuri TOT-The Online Tutor
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
Resonance V/S Mesomeric effect |Organic Chemistry|
Resonance V/S Mesomeric effect |Organic Chemistry|
Published: 2017/07/06
Channel: ChemistryConcept
Lecture 4   Conjugation, Mesomeric effect and resonance   1
Lecture 4 Conjugation, Mesomeric effect and resonance 1
Published: 2017/07/26
Channel: QnA Depot
Trick For Mesomeric Effect | CHEMISTRY | JEE \ NEET | By Chintan Sir
Trick For Mesomeric Effect | CHEMISTRY | JEE \ NEET | By Chintan Sir
Published: 2017/08/01
Channel: CHEMISTRY JEE \ NEET
MESOMERIC EFFECT 2 JEE MAINS ADVANCED 12th cbse icse
MESOMERIC EFFECT 2 JEE MAINS ADVANCED 12th cbse icse
Published: 2014/02/14
Channel: bhaskar sharma
mesomeric effect 2(organic chemistry)
mesomeric effect 2(organic chemistry)
Published: 2016/12/25
Channel: Kattamuri TOT-The Online Tutor
MESOMERIC Effect in hindi
MESOMERIC Effect in hindi
Published: 2017/07/23
Channel: ONLINE EDUCATION
MESOMERIC EFFECT
MESOMERIC EFFECT
Published: 2012/10/18
Channel: iProfIndia
Inductive Effect - Reaction Mechanisms
Inductive Effect - Reaction Mechanisms
Published: 2015/11/16
Channel: tick Links
Renaming the "Mandela effect" to the "M-Effect" Rapture is Near!
Renaming the "Mandela effect" to the "M-Effect" Rapture is Near!
Published: 2016/06/19
Channel: ncbookz.com llc
mesomeric effect المحاضره الخامسه كليه الصيدله جامعه الزقازيق
mesomeric effect المحاضره الخامسه كليه الصيدله جامعه الزقازيق
Published: 2016/11/16
Channel: Abdalla ELnagar
Effet inductif et effet mésomère en bref | Inductive effect & Mesomeric effect
Effet inductif et effet mésomère en bref | Inductive effect & Mesomeric effect
Published: 2015/07/24
Channel: Feynbert
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Channel: Srivastava Classes
Inductive Effect
Inductive Effect
Published: 2013/05/03
Channel: AK LECTURES
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Resonating effect / Resonance / Mesomeric effect for JEE , NEET , CBSE & state boards-Organic
Published: 2017/01/10
Channel: Pradeep Sharma
Mesomeric Effect, Mesomeric Effect Mechanism
Mesomeric Effect, Mesomeric Effect Mechanism
Published: 2012/08/21
Channel: vedupro
Revisit to Electronic Effects: Inductive and Mesomeric Effects (CHE)
Revisit to Electronic Effects: Inductive and Mesomeric Effects (CHE)
Published: 2017/01/17
Channel: Vidya-mitra
Mesomeric effect 1 (for iit students) BY R. K. Bhardwaj
Mesomeric effect 1 (for iit students) BY R. K. Bhardwaj
Published: 2015/08/17
Channel: kalu das
Mesomeric Effect for NEET, IIT-ADVANCE LEVEL.
Mesomeric Effect for NEET, IIT-ADVANCE LEVEL.
Published: 2017/07/19
Channel: CHANAKYA CHANNEL (JEE MAIN+IIT ADVANCE)
Organic Chemistry- Reaction Mechanism (Resonance Effect or Mesomeric Effect), Class 11th NCERT
Organic Chemistry- Reaction Mechanism (Resonance Effect or Mesomeric Effect), Class 11th NCERT
Published: 2016/11/04
Channel: Chemistry Class XI
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
Resonance Effect-Organic Chemistry-Basic Information-Mesomeric Effect
Published: 2012/09/01
Channel: Silly Learner
What is Mesomeric effect ?
What is Mesomeric effect ?
Published: 2013/04/25
Channel: rich TV
Organic chemistry(Mesomeric effect -23)
Organic chemistry(Mesomeric effect -23)
Published: 2016/10/14
Channel: DIGICLASS A
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
GOC Mesomeric Effect IN ORGANIC CHEMISTRY
GOC Mesomeric Effect IN ORGANIC CHEMISTRY
Published: 2017/03/13
Channel: Jam Chem
Copy of Mesomeric Effect for NEET, IIT-ADVANCE LEVEL.
Copy of Mesomeric Effect for NEET, IIT-ADVANCE LEVEL.
Published: 2017/07/19
Channel: CHANAKYA CHANNEL (JEE MAIN+IIT ADVANCE)
Chemistry Organic Chemistry Basics part 31 (Resonance) CBSE class 11 XI
Chemistry Organic Chemistry Basics part 31 (Resonance) CBSE class 11 XI
Published: 2013/06/14
Channel: ExamFear Education
MESOMERIC Effect in BENGALI
MESOMERIC Effect in BENGALI
Published: 2017/07/21
Channel: ONLINE EDUCATION
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
Resonance effect in organic chemistry ( Basics )- IITJEE Organic chemistry
Resonance effect in organic chemistry ( Basics )- IITJEE Organic chemistry
Published: 2016/07/27
Channel: Any Time Padhai Academy
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
Mechanism of Organic Reactions for IIT JEE - Mesomeric Effect Type and Hyperconjugation Effect
Mechanism of Organic Reactions for IIT JEE - Mesomeric Effect Type and Hyperconjugation Effect
Published: 2017/11/09
Channel: Unacademy - JEE Prep
Resonance Effect Part 1 - Introduction
Resonance Effect Part 1 - Introduction
Published: 2017/01/08
Channel: Busting JEE Main
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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. Bibcode:2006JChEd..83..223K. doi:10.1021/ed083p223. Archived from the original on 2006-10-04. 

External links[edit]

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