Acidity of Organic Acids
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Acid Formula acidity increases going up the table Acidity decreases with increasing length.
methanoic acid HCOOH
ethanoic acid CH3COOH
propanoic acid CH3CH2COOH
octadecanoic acid CH3(CH2)16COOH

Acid Formula acidity increases going up the table Acidity increases with the increase of the electronegativity of adjacent groups.
fluoro ethanoic acid FCH2COOH
chloro ethanoic acid ClCH2COOH
bromo ethanoic acid BrCH2COOH
iodo ethanoic acid ICH2COOH

Acid Formula acidity increases going up the table Acidity increases with the increase of the number of adjacent electronegative groups.
trichloro ethanoic acid Cl3CCOOH
dichloro ethanoic acid Cl2CHCOOH
chloro ethanoic acid ClCH2COOH

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