An introduction to organic reaction

In this lessonWe learn about an introduction to organic reaction : Acid and Bases, and I less understood about
Question : What is relationship between structur and acidity?

According My opinion The strength of an acid depends on the extent to which a proton can be separated from it and transferred to a base.Breaking a bond to the proton Þ the strength of the bond to the proton is the dominating effect.
The Acidity of Carboxylic Acids
Carboxylic acids are much more acidic than the corresponding alcohols: pKas for R–COOH are in the range of 3-5;.pKas for R–OH are in the range of 15-18.
An Explanation Based on Resonance Effects
Resonance stabilized acetate anion: The greater stabilization of the carboxylate anion (relative to the acid) lowers the free energy of the anion and thereby decreases the positive free-energy change required for the ionization. Any factor that makes the free-energy change for the ionization of an acid less positive (or more negative) makes the acid stronger.
An Explanation Based on Inductive Effects
The inductive effect of the carbonyl group (C=O group) is responsible for the acidity of carboxylic acids.
Organic Compounds as Bases

An organic compound contains an atom with an unshared electron pair is a potential base. The p bond of an alkene can act as a base.
NIM : RSA1CI10020

0 komentar:

Poskan Komentar

Write here, about you and your blog.
Copyright 2009 Chemistry All rights reserved.
Free Blogger Templates by
Wordpress Theme by EZwpthemes