what are mesomers?explain briefly with one example?

N JYOTHEESWAR, 8 years ago

Grade:12th pass

16 Answers

sri tanish

66 Points

8 years ago

mesomers are a type of compounds in which net rotation of plane polarised light is zero . i.e to be simple , mesomers are type of organic compounds where two chiral carbons are present and those two are similar , so net rotation is zero .

Approved

Prabhakar ch

577 Points

8 years ago

The mesomeric effect in chemistry is a property of substituents or functional groups in a chemical compound

SAI SARDAR

1700 Points

8 years ago

Jyotheeswar, Mesomers are in srereo isomers.Mesomers are which have sigma plane and we devide into two parts then two parts are same,that is called mesomer.

Gowri sankar

292 Points

8 years ago

DEAR JYOTHI, MESOMERS ARE IN STEREO ISOMERS.MESOMERS ARE WHICH HAVE SIGMA PLANE AND WE DEVIDE INTO TWO PARTS ARE SOME THAT IS CALLED MESOMER.

T.kumar

281 Points

8 years ago

, MESOMERS ARE IN STEREO ISOMERS.MESOMERS ARE WHICH HAVE SIGMA PLANE AND WE DEVIDE INTO TWO PARTS ARE SOME THAT IS CALLED MESOMER.this my answer......

Gaddam Chethan

317 Points

8 years ago

Hello Jyothi The mesomeric effect in chemistry is a property of substituents or functional groups in a chemical compound

RAMCHANDRARAO

159 Points

8 years ago

MESOMER IS ONE TYPE OF STEREO ISOMER A COMPOUND HAVING TWO CHIRAL CENTERS DIVIDE THE THE TWO PARTS IF TWO PARTS ARE EQUAL THEN COMPOUND HAVING MESOCOMPOUND

raj

383 Points

8 years ago

hellow jyotheeswar reddy

A meso compound is an achiral compound that has chiral centers. It is superimposed on its mirror image and is optically inactive although it contains two or more streocenters.The mesomeric effect or resonance effect in chemistry is a property of substituents or functional groups in a chemical compound.

Y MANJUNADH

131 Points

8 years ago

mesomer is one type of sterio isomer a compound having two chiral divide the two parts if two are equal then compound having meso compound

sreekanth sree

125 Points

8 years ago

hi jyothi 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 a permanent effect and operates in compounds containing atleast one double bond and another double bond.

Dheeru chowdary

100 Points

8 years ago

dear jyothi,

sterioisomers which are achiral instead of chiral r called as the mesomers

….….….alll d best!@

manichandra

109 Points

8 years ago

Jyotheeswar Mesomers are in srereo isomers.Mesomers are which have sigma plane and we devide into two parts then two parts are same,that is called mesomer.

mohan

216 Points

8 years ago

dear iitian............

Stereoisomers which are achiral inspite of having chiral centres are called mesomers….….….….….….….….….….….….….….….….….….…..

Flore Ferrara

24 Points

7 years ago

Actually , you messed up a with the differents isomers, no one provided similar answers..

The terms "mesomerism" or"resonance “ are both used for the model describing the displacement of electrons or protons (used in diffeaction) in a molecule (π ("pi")electrons of π bonds, lone pairs, and electric charges) which stabilize this molecule.
Mesomerism is an Imaginary model; 2 resonances structures drawn on paper are not isolables physically because they really don't exist! What exist is the resonance hybrid (the molecule which is the hybrid of those 2 , or more, structures).

By convention we use a simple double arrow head between mesomers in Lewis representation.

There is several exemples like :
1) conjugaison between 2 pairs of π electrons
( buta-1,3-diene)
2)conjugaison between pairs of π electrons and lone pairs
(phenol)
3) conjugaison between a pair of π electrons and an "empty case"
(nitrobenzene)
4) conjugaison between a lone pair and an "empty case"

Beware! Often people confound tautomerism and mesomerism, but the former is a constitutional isomer , a real chemical reaction occurs ( in many case result in relocation of a proton-and studied with diffraction) so for two tautomers, there are two isolable forms experimentally with ,of course different properties; also here you use two supperposed arrow with the upper pointing right and the other pointing left.

Still, keep in mind that orbitals(AO/MO) , bonds , charges,particles or waves are presented in a classical view that don't describe the quantum realm in the best way, but are useful simplifications taught at school

Ps: I couldn’t insert a picture to illustrate my exemples but I think there are plenty elsewhere

Jai Kesav

24 Points

6 years ago

Mesomers are compounds that have chiral centres ( more than one ), and also have a plane of symmetry. They are optically inactive. Thus they do not rotate plane polarized light. The effect on plane polarized light due to the various chiral centres cancel out making the compound optically inactive.

This phenomenon is called internal compensation.

hope this helped

Rishi Sharma

askIITians Faculty 646 Points

3 years ago

Dear Student,
Please find below the solution to your problem.

A meso compound is an achiral compound that has chiral centers. It is superimposed on its mirror image and is optically inactive although it contains two or more streocenters.The mesomeric effect or resonance effect in chemistry is a property of substituents or functional groups in a chemical compound.