|Class 12 Chemistry Aldehydes Ketones Acids||Chemical properties of Carboxylic Acid|
Chemical properties of carboxylic acid
Main four types of reactions shown by them:
If we talk about Strength of acidic character of CH3 COOH,then we have :
CH3 COOH + H2O --> CH3 COO- + H3O+
According to Arhenius acid and Bronstedconcept: Carboxylic acid is regarded as an acid.We can write its expression for dissociation constant as written below.
It is seen that :
Effect of substituents on strength of acid
We can have subsituents of two types :
Electron withdrawing subsituents: They will neutralize the intensity of -ve charge and hence, RCOO- ion gets stablized. Therefore , the acid srength increases. Eg:Halogens
Electron releasing subsituents : They will increase the intensity of negative charge and hence ,RCOO- ion gets less stablized. Therefore, acidic strength due to this decreases.
The acidic strength also depends upon other factors such as :
Fluroine is much more electronegative
Acidic Strength CH3COOF more stronger acid > CH3COCl
BrCH3COOH > CH3COOI