acidity & basicity

[sunnybinny]

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can someone explain about the acidity ranking in organic ? ..
(not the aromatic ring stuff,,) but ,,questions like which hydrogen is
most acidic and etc,,,,,


thank you,,

 

[yorkiepoo]

it depends on the molecule... if you are refering to a carboxylic acid for example, the most acidic H is going to be the H from the OH group of the carboxylic acid. The second most acidic in a carboyxlic acid (which is the most acid H in a ketone/aldehyde) is the hydrogens on the alpha carbon (the one next to the carbonyl carbon). By acid H, what it really means is, easiest to come off.