Aldehydes Ketones And Carboxylic Acids

Step 1: Understanding the effect of substituents.
The acidity of carboxylic acids increases with the electronegativity of the substituent attached to the aromatic ring or the alpha-carbon. The electron-withdrawing effect of fluorine (in CF ) is stronger than that of chlorine (in CCl or CHCl ) or hydrogen (in CH ).

Step 2: Identifying the most acidic compound.
Among the given acids, CF COOH has the strongest electron-withdrawing group (CF ), which increases its acidity.

Step 3: Conclusion.
The most acidic compound is CF COOH, which corresponds to option (1).

Step 1: Etard Reaction.
The Etard reaction is a chemical reaction in which an aromatic aldehyde (usually toluene) reacts with chromium (VI) chloride ( ) to form an aromatic aldehyde. The reaction is used to introduce an aldehyde group into the aromatic ring. The reaction is:

Step 2: Conclusion.
The Etard reaction is important in organic synthesis for the oxidation of methyl groups to form aldehydes.

Step 1: Uses of Carboxylic Acids.
1. In the preparation of soaps: Carboxylic acids, such as fatty acids (e.g., stearic acid), are used in the production of soaps through saponification, where they react with alkalis to form salts. 2. As preservatives: Carboxylic acids like acetic acid are used as preservatives in food (e.g., vinegar) to prevent the growth of bacteria and mold.

Step 2: Conclusion.
Carboxylic acids are widely used in industries, especially in the production of soaps and as food preservatives.