Payal posted an Question
August 13, 2020 • 17:23 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Compare the relative acidic strength of the following.

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  • Suman Kumar Best Answer

    3 is most acidic

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    P-nitrophenol> o-nitrophenol > m-nitrophenol

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    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.

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    3>1>2>4. This is the order

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    thank you sir

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    I got it

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    You are welcome Meghna 😊😘

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    Priyanshu kumar best-answer

    para nitro phenol is most acidic so order 3>1>2>4

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    Phenol is least acidic among these

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    ortho nitro phenol is little less acidic than para nitro phenol due to intramolecular H bonding

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    meta nitro phenol is less acidic than para and ortho as at meta position only -I effect works

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    At ortho and para position both -M and -I effect works

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    thank you

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    always welcome meghna😊

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