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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Achyut ranjan gogoi
order will be 3>1>4>2 as no2 is the most deshielding group amongst all and then cho then ammonium and methyl has +I effect so it has the highest amongst all. except me all shows -I effect. -I effect order no2> cho>NH3+