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Preparation of Carboxylic Acids

Explain the p...

Question

Explain the preparation of carboxylic acids from Grignard reagent. Give equation.

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Solution

Grignard reagent reacts with solid $C O_{2}$ (dry ice) to form magnesium salt of carboxylic acid. This is followed by acidification to obtain carboxylic acid. For example, the reaction between methyl magnesium bromide and carbon dioxide followed by acid hydrolysis will give acetic acid.

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Q. How are carboxylic acids prepared using Grignard reagent?

Q. Carboxylic acids may be prepared by the reaction of Grignard reagents with :

Q. a) Give resonating structure of carboxylic group?
b) Give chemical reaction to obtain the following.
i) Carboxylic acid from Grignard reagent.
ii) Benzoic acid from ethyl benzoate.
iii) Benzamide from benzoic acid.
c) Give resonating structures of propenoic acid?
d) How will you distinguish aldehyde, ketone & carboxylic acid.

C_{8} H_{9} B r

isomers form Grignard reagents and then, on carboxylation, give isomeric carboxylic acids. Oxidation of each isomeric acid with hot

K M n O_{4}

produces the same

C_{9} H_{6} O_{6}

tricarboxylic acid. Which of the following compounds are the original isomeric bromides?

Q. Which of the acids cannot be prepared by Grignard reagent?

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