Write down the Hammett equation and the comment on the equilibrium that Hammett used to define...
Write down the Hammett equation and the comment on the equilibrium
that
Hammett used to define it ?
Homework Answers
Hammett equation relates equilibrium
constant (K) or rate
constant (k) for
substituted and that for the unsubstituted compound in a
given reaction in terms of two parameters 
and 
.
According
to Hammett, log
Kx= log
KH+
Kx and KH are equilibrium constant for substituted and unsubstituted compound
- reaction constant
- the substituent constant
Hammett uses, dissociation of substituted and and unsubstituted benzoic acid for the formulation of the equation, which is as presented below.
X-C6H5COOH 
X-C6H5COO-
+ H+
X= H , for unsbstituted benzoic acid
X = any other group (electron donating or withdrawing) for substituted benzoic acid
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