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Explain the following : (i) o - nitrophenol is more acidic than meta - nitrophenol. (ii) Phenol gets coloured on long standing. (iii) o - nitrophenol is steam volatile while, p -nitro - phenol is not. (iv) Phenol does not undergo substitutions at the carbon oxygen bond. |
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Answer» <P> Solution :(i) Due to Ortho Effect. Which STATES that any group PRESENT at ortho position increases the ACIDIC character.(ii) Due to oxidation by air. (iii) o - Nitrophenol have weaker intramolecular hydrogen bonding as to p - nitrophenol which have intermolecular hydrogen bonding. (iv) The carbon to which oxygen is attached is `sp^(2)` hybridised. |
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