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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Suman Kumar Best Answer
3 is most acidic
P-nitrophenol> o-nitrophenol > m-nitrophenol
Nitro group has both M-effect (mesmeric effect) and I-effect (inductive Effect) but M-effect predominates over I-effect. NO2 group at o and p position withdraws electron of o-h bond towards it by stronger M-effect while the NO2 group at m position withdraws electron of o-h bond by weaker I -effect . Thus o and p are nitrophenols are more acidic than m-nitrophenol. However o-nitrophenol is little less acidic than p-nitrophenol due to intramolecular h-bonding which makes loss of proton little more difficult... So, p-nitrophenol is strongest.
3>1>2>4. This is the order
thank you sir
I got it
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