What is mesomerism? brief explanation
Hii manohar
Mesomerism or resonance is used for chemical structure which is not satisfactorily explained by single lewis structure.
For eg the allyl radical have two equivalent c-c bonds.and can be denoted as
. .
CH 2- CH=CH2 ~ CH2=CH-CH2
these two mesomeric structures cannot solely describe the fact.
The mesomeric effect occur in compound having containing atleast one double bond.
The mesomeric effect is negative when the substituent is an electron withdrawing group while ut is positive when the substituent is electron releasing group..
I hope this will help you
Good luck
Mesomerism is a chemical phenomenon which explains the existence of organic chemical structures that cannot be accurately represented by a single structural formula, the actual formula lying intermediate between several possible representations that differ only in the position of electrons.
The mesomeric effect is a permanent effect and operates in compounds containing at least one double bond and another double bond or a lone pair separated by a single bond.
Hope this helps.