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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 Feb 2008 20:55:26 IST
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The ques is correct,
When U luk at the Pka values, CH3OH is more acidic than H2O.
Many of U hav given +I effect as the reason but its not true becoz +I effect wud INCREASE BASICITY NOT ACIDITY.
Although alcohols are less acidic than water but this exception can be explained only in one way-
See, in CH3OH, First of all the C-O bond is polar and secondly due to +I effect of CH3, the polarity of the bond increases, and in comparison to this, the OH-H bond is less polar as H has no inductive effect.
So CH3-OH, being polar breaks out easily thus giving H, and hence is more acidic.
See, the acidity diff is very less. The Pka of water=15.7 and that of CH3OH=15.5, so the diff is very less. They are almost equally acidic, but still the explanation can be the one given by me.
Hope U got it.
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