IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

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1, which is weakest acid

a. acitic acid

b, farmic acid

c, oxalic acid

d. no them

virendera dwivedi

aravindh_ramaswamy

acetic acid is the weakest because of +I ch3 group and hence no charge dispersal takes place in the anion(acetate ion) thereby rendering it unstable.

Always remember:

more stable the anion,more stronger is the acid.

Plz. rate me if u find this useful.

mohnish_khiani

Strength of an acid is directly proportional to -I effect of the group attached to the acyl carbanion.This is so because -I group decreses the -ve charge on the carbanion making it more stable.
so according to this order of stablity is
oxalic acid > formic acid > acetic acid.

ApoorvKhatreja

Oxalic Acid > Formic Acid > Benzoic Acid > Acetic Acid

Refer to this thread for more info.

http://www.goiit.com/posts/list/organic-chemistry-arranging-of-given-compunds-according-to-their-16858.htm

And an advice - Check out your spellings ;).

sudeep.kumar

aravindh is correct..
Acetic acid is the weakest, due to the electron donating tendency of the sigma bond b/w the C of methy and -COOH
in formic acid, there is no electron donating group,
while in acetic acid, the two -COOH groups act as electron withdrawing group for each other, thus increasing the acidity..

electron withdawing groups increases the polarity of the O-H bond and thus increases the acidity, while electron releasing groups does the opposite.

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