What is a carboxyl group?

Carboxyl group or carboxylic acid group is a combination of four atoms that act as a unit: one carbon (C), two oxygen (O) and one hydrogen (H). Organic chemists usually write the structure of the carboxyl group simply -COOH, or -CO 2 . Oxygen linked to the immediate right to carbon shares its valence electrons with this atom, and forms a carbonyl group (-C = O). The second oxygen is connected to the same carbon and hydrogen only by means of individual bonds, resulting in a hydroxyl group of carbon (-c-oh).

Organic compounds containing one or more carboxylic groups are called carboxylic acids. Two common examples of individual carboxyl carboxylic acids are antic acid (HCOOH), which was first prepared from distillation of ants and acetic acid (ch 3 COOH), Octa fermentation. VigorAvelic is the simplest of the carboxylic acid group. Its chemical structure can be drawn as HOOC-COOOH or (COOH) _{2 . Oxygen -containing acids containing oxygen are usually stronger than can be expected. When the hydrogen leaves, its electron remains behind. Although it is a phenomenon in nature that says he "desires" to be neutralized, other factors such as resonance can greatly stabilize charged chemical species. For visualization, it is necessary to re -consider the structure of the carboxyl group at a more detailed level.}

in carboxylate, hydroxyl group falling into carbon, -C -oh changes to -c -o ^{- . Free electron-resort, small minus drawn in the upper right corner of oxygen, but alone, written as e -}-has some freedom to move.

On the contrary, the second oxygen should be able to pick up the electron -c = o + e

-

→ -c-o -. The point is that both oxygens are equivalent in this environment, in which neither is overcast by the hydrogen atom. At least on paper, the electron should be able to resonate or travel here and there between two oxygen atoms.

logically, this resonance should stabilize carboxylate due to electron deocization. In addition, even oxygen should not be connected to a carbon with one or double binding. The length of bonds should be the same and be something as a "one and a half" binding. They are actually. In acetic acid, the carbonyl binding length is 1.21 and the hydroxyl connected to the carbon has a length of 1,36, while in carboxylate the two lengths of the carbon are 1.26 á