Question #ed5b4

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Question #ed5b4

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Answer 1 · 2017-03-03T06:09:03

1) The functional group of the compound A of molecular formula $C_{2} H_{4} O_{2}$ $C_2H_4O_2$ , widely used as a preservative in pickles is

-COOH

and the compound is ethanoic acid commonly known as acetic acid having structural formula $C H_{3} C O O H$ $CH_3COOH$

2) The chemical equation for the reaction with ethanol $(C H_{3} C H_{2} O H)$ $(CH_3CH_2OH)$ is as follows. The sweet smelling compound B formed here is an ester named ethyl ethanoate and the reaction occurs in presence of conc. $H_{2} S O_{4}$ $H_2SO_4$

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3)The Compound A can be reproduced from B by hydrolysis

4) The name of the process is hydrolysis . In this process B is heated with aqueous solution of $N a O H or K O H$ $NaOHorKOH$ and the ethanol produced escapes as volatile matter. As a result a solution of sodium ethanoate is obtained. This solution on heating with . $H_{2} S O_{4}$ $H_2SO_4$ solution gives back the ethanoic acid.

Equations may be written as follows

$C H_{3} C O O C H_{2} C H_{3} + N a O H \to C H_{3} C O O N a + C H_{3} C H_{2} O H$ $CH_3COOCH_2CH_3 +NaOH->CH_3COONa+CH_3CH_2OH$

$C H_{3} C O O N a + H^{+} \to C H_{3} C O O H + N a^{+}$ $CH_3COONa+ H^+ ->CH_3COOH + Na^+$

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Question #ed5b4

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-COOH

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