Benzoic Acid : Uses, Structure, Properties

Benzoic Acid.

Benzoic Acid

It is simplest aromatic carboxylic acid.
Benzoic Acid Preparation.
Benzoic acid is prepared:
(1) By oxidation of alkylbenzenes with acidic potassium permanganate or sodium dichromate.

Benzoic acid prepared By oxidation of alkylbenzenes.

(2) By reaction of phenylmagnesium bromide with carbon dioxide followed by acid-hydrolysis of the addition product.

Benzoic acid prepared By reaction of phenylmagnesium bromide.

(3) By acid-hydrolysis of phenyl cyanide (benzonitrile).

Benzoic is prepared By acid-hydrolysis.

(4) By basic-hydrolysis of benzotrichloride. Benzotrichloride is obtained by chlorination of toluene.

Benzoic is prepared By basic-hydrolysis of benzotrichloride.

Physical Properties of Benzoic Acid.

Benzoic acid is colourless solid, mp 122ºC. It is soluble in hot water, diethyl ether, ethanol, and benzene. It is steam-volatile, Benzoic acid is a slightly stronger acid than acetic acid (ka = 6.3×10-5; 1.75×10-5). The characteristic carbonyl IR stretching absorption for benzoic acid is found at 1710-1720 cm-1.

Chemical Properties of Benzoic Acid.

The reactions of benzoic acid are those of the carboxyl group and the benzene ring.

Benzoic Acid Uses.

Benzoic acid is used:
  1. As germicide-in medicine for urinary infection and in vapour form for disinfecting bronchial tubes.
  2. As food preservative-sodium benzoate is used for preserving pickles, tomato ketchup, and fruit juices.

Benzoic Acid Structure.

Benzoic Acid Structure.

Benzoic acid is a organic compound and chemical formula is C7H6O2or C6H5COOH.

Benzoic Acid Boiling Point.

Benzoic acid boiling point is 249.2 °C.

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