• AglaSem
  • Schools
  • Admission
  • Career
  • CutOffs
  • News
  • Hindi
  • Mock Test
  • Docs
  • ATSE
aglasem
  • CBSE
    • Date Sheet
    • Question Papers
    • Sample Papers
  • ICSE / ISC
  • State Boards
    • Date Sheet
    • Result
  • NCERT
    • NCERT Books
    • NCERT Solutions
    • NCERT Exempler
    • Teaching Material
  • Mock Tests
  • Study Material
    • Notes
  • Olympiads
    • ATSE
    • KVPY
    • NTSE
    • NMMS
  • School Admission
  • Entrance Exams
    • JEE Main
    • NEET
    • CLAT
  • Students Guide
    • Careers Opportunities
    • Courses & Career
    • Courses after 12th
  • Others
    • HC Verma Solutions
    • Teaching Material
    • Classes Wise Resources
    • Videos
    • Resources
No Result
View All Result
aglasem
  • CBSE
    • Date Sheet
    • Question Papers
    • Sample Papers
  • ICSE / ISC
  • State Boards
    • Date Sheet
    • Result
  • NCERT
    • NCERT Books
    • NCERT Solutions
    • NCERT Exempler
    • Teaching Material
  • Mock Tests
  • Study Material
    • Notes
  • Olympiads
    • ATSE
    • KVPY
    • NTSE
    • NMMS
  • School Admission
  • Entrance Exams
    • JEE Main
    • NEET
    • CLAT
  • Students Guide
    • Careers Opportunities
    • Courses & Career
    • Courses after 12th
  • Others
    • HC Verma Solutions
    • Teaching Material
    • Classes Wise Resources
    • Videos
    • Resources
No Result
View All Result
aglasem
No Result
View All Result

Class 11 Chemistry Notes GOC – Mesomeric Effect (Resonance Effect)

by Anand Meena
April 22, 2019
in 11th Class, Class Notes
Reading Time: 2min read
0
Class 11 Chemistry Notes General Organic Chemistry - AglaSem
1
SHARES
0
VIEWS
Share on FacebookShare on Twitter

Mesomeric Effect (Resonance Effect)

  • Mesomeric effect is valid only for conjugated system.
  • There are two types of Mesomeric effect:

                                          + M Effect (+ R) and – M Effect (- R)

  • Consider the following conjugated system

                            

                              (+M effect of y)

  • Consider another conjugated system

                            

                               (-M effect of NO2)

Mesomeric Effect in Phenol (+ M Effect)


Mesomeric Effect in Aniline (+ M effect)

  • If more of e- towards ring (+ M effect)
  • This effect increases the electron density over benzene ring.

– M effect in Benzaldehyde

Ex. Identify the compound showing +M or –M separately

Sol. (a) (-M)          (b) (-M)        (c) +M


* +M group increases electron density of ring while –M decreases the electron density of benzene ring.

If NO2 is present on the ortho or para position then along with it’s –I effect, it will also show –M effect.


Above compound have +M of -OH and –M of NO2 group.


As we can easily see that –NO2 at Meta position is not attracting e-density towards itself and that’s why it will not show –M effect at meta-position.

« Click Here for Previous Topic Click Here for Next Topic »

Click Here for Class XI Classes Chemistry All Topics Notes

To get fastest exam alerts and government job alerts in India, join our Telegram channel.

Tags: 11 Chemistry11 Class ChemistryCBSE 11 NotesCBSE NotesChemistry for Class 11Class 11 NotesClass 11thClass 11th NotesClass XI ChemistryFree NotesXI Class

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

Related Posts

11th Class

BHU SET 2021 – Notification (Released)

KVPY 2020
11th Class

KVPY 2020 – Kishore Vaigyanik Protsahan Yojana Tentative Answer Key (Out), Result

11th Class

FYJC Admission 2020 – 21: 11th Admission, FCFS Round Schedule (Published, 11thadmission.org.in

10th Class

IARCS Olympiads: Indian Association for Research in Computing Science

Next Post
Class 11 Chemistry Notes General Organic Chemistry - AglaSem

Class 11 Chemistry Notes GOC - Resonance

Discussion about this post

Registration Open!!

Indian Talent Olympiad Click Here
Indian Talent Olympiad - Apply Now!!

Class Wise Study Material

  • Class 1
  • Class 2
  • Class 3
  • Class 4
  • Class 5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12
  • Disclaimer
  • Terms of Use
  • Privacy Policy
  • Contact

© 2019 aglasem.com

No Result
View All Result
  • CBSE
  • ICSE / ISC
  • State Board
  • NCERT
  • Mock Test
  • Study Material
  • Olympiads
  • Schools Admission
  • Entrance Exams
  • Student Guide
  • HC Verma Solutions
  • Videos

© 2019 aglasem.com

AglaSem Notes Click Here