How do I remember priorities of I-effect, M-effect, H-effect? Any mneu

1.	How do I remember priorities of I-effect, M-effect, H-effect? Any mneumonics?
Answer» all ELECTRON withdrawing GROUPS are electronegative and have -I effect. Electron donating groups are electro positive and have +I effectExplanation:eg of -I NO2 etceg of +I CH3, C2H5 etc

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