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![[Post New]](/templates/default/images/icon_minipost_new.gif) 20 Apr 2008 12:46:21 IST
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hey guys ????  why is HCOOH A STRONGER ACID THAN CH3 COOH ? ACCORDING 2 ME AS CH3 HAS +I EFFECT IT INCREASES POLARITY OF O-H BOND SO INCREASES ACIDITY .  IS THIS AN EXCEPTION ????
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20 Apr 2008 12:50:30 IST
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no....CH3 group has +I ....thus when H+ leaves the - on O is destabilised by the +I of CH3 group...hope u got it....
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20 Apr 2008 13:06:25 IST
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YA ANANTH ,
THE CH3 BOND INCREASES THE ELECTRON CLOUD DENSITY ON O ATOM RIGHT ? SO DOES IN NOT MEAN IT MAKES IT MORE POLAR . AND ISNT POLARITY IN DIRECTION OF O-H , INCREASE ACIDIC STRENGTH ?
I GOT UR POINT THAT ADDIND ELECTRON CLOUD TO O MMINUS ION IS DESTABILISING FACTOR . COZ ITS ALREADY ATTAINED OCTET . BUT AM I RIGHT ? IS THE SAME TREND FOLLOWED EVERYWHERE ? LIKE +I EFFECT GROUP DECREASES ACIDITY ?
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20 Apr 2008 13:18:12 IST
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dude ur correct that CH3 increases the electron cloud density on O atom, but it decreases the polarity....
what is polarity in general...difference between the electronegativity...so when O gets a partial negative charge the electronegatavity of O decreases....hence the polarity also decreases...and more covalent the bond, easier it is to break the bond...
ya dude everywhere, same trend....more +I more basicity...
hope its clear....
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