Question

convert ethyl chloride to propanoic acid......
use kcn then complte hydrolysis

Answer 1

**CH3CH2Cl + KCN = CH3CH2CN
**CH3CH2CN ,on partial hydrolysis. gives CH3CH2CONH2
**CH3CH2CONH2,on complete hydrolysis give CH3CH2COOH

Answer 2

Potassium cyanide is the simplest approach to make Propanoic acid from Ethyl chloride, and the intermediate product is hydrolyzed to make the final product.

Process involved in the conversion of ethyl chloride to propanoic acid

• The group that takes the electron pair and displaces it from the carbon in nucleophilic substitution reactions is known as the leaving group, and the molecule on which substitution occurs is known as the substrate.
• The potassium cyanide reacts with the alkyl chloride. The chloride ion is replaced by the cyano group.

• When nitriles are hydrolyzed, they react with water in two stages: first to form an amide, and subsequently to produce the carboxylic acid's ammonium salt.

• Instead, a dilute acid, such as dilute hydrochloric acid, or an alkali, such as sodium hydroxide solution, are used to heat the nitrile. The nitrile is heated under reflux with dilute hydrochloric acid when acidic hydrolysis of nitriles is required.

• Ethanoic acid is produced when the ethanoate ions in ammonium ethanoate combine with hydrogen ions in hydrochloric acid. Because ethanol is a weak acid, it tends to hold on to the hydrogen ion once it has it.

Final equation:

$CH_{3} - CH_{2} - Cl +KCN$ → $CH_{3} - CH_{2} - CN + KCl$

$CH_{3} - CH_{2} - CN + KCl$  → $CH_{3} - CH_{2} -COOH$

                                         

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