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State reasons for the following situations: (i) Monochloroethanoic acid is a weaker acid than dichloro ethanoic acid. (ii) Benzoic acid is a stronger acid than ethanoic acid. |
Answer» Solution :(i)  Chlorine atom exerts -I effect. This helps in the release of protons. There is a ONE chlorine atom inmonochloroethanoic acid and two chlorine atoms in dichloroethanoic acid. Due to smaller -I-effect in monochloroethanoic acid than dichloroethanoci acid, the former is weaker acid than the latter.  Benzene ring withdraws electrons towards itself due to resonance. One the other hand, `-CH_(3)` group is electron replling group. Therefore, the release of protons in benzoic acid will tbe INCREASED while it will be decreased in the case of ethanoic acid. Thus, benzoic acid is STRONGER acid than ethanoic acid. |
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