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Can you please give the decrasing order of -M and +M groups

Asked by musira29rahman 20th August 2019, 1:44 PM
Answered by Expert
Answer:
(1) groups which donate electrons to the double bond or to a conjugated or aromatic system are said to have +R or +M effect.
 
-OH > -OR > -SH > -SR > -NH2 > -NHR > -NR2 > -Cl > -Br > -I
 
(2) groups which withdrawelectrons from the double bond or from a conjugated system towards themsilves due to resonance are said to have -R or -M effect.
 
=C=O > -CHO > -COOR > -CN > -NO2
Answered by Expert 20th August 2019, 3:04 PM
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