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(b) Mohan heated ethanol with a compound 'X' in the presence of a few drops of conc. $\ce{H2SO4}$ and observed a sweet smelling compound 'Y' is formed. When 'Y' is treated with sodium hydroxide it gives back ethanol and a compound 'Z'.
(i) Identify 'X', ‘Y” and “Z”.
(ii) Write the role of conc. $\ce{H2SO4}$ in the reaction.
(iii) Write the chemical equations involved and name the reactions.
(i) Identify 'X', ‘Y” and “Z”.
(ii) Write the role of conc. $\ce{H2SO4}$ in the reaction.
(iii) Write the chemical equations involved and name the reactions.
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(i) X - $\ce{CH3COOH}$/ethanoic acid /acetic acid
$\frac{1}{2}$
Y - $\ce{CH3COOC2H5}$/$\ce{CH3COOCH2CH3}$/ ester/ ethyl ethanoate
$\frac{1}{2}$
Z - $\ce{CH3COONa}$/sodium ethanoate/sodium acetate
$\frac{1}{2}$
(ii) Catalyst / dehydrating agent
$\frac{1}{2}$
(iii)
$\ce{CH3-COOH + CH3-CH2OH <=>[Acid] CH3-C-O-CH2-CH3 + H2O}$
• Esterification reaction
$\frac{1}{2}$
• $\ce{CH3COOC2H5 + NaOH -> CH3COONa + C2H5OH}$
1
• Saponification reaction/ De-esterification reaction
$\frac{1}{2}$
5
$\frac{1}{2}$
Y - $\ce{CH3COOC2H5}$/$\ce{CH3COOCH2CH3}$/ ester/ ethyl ethanoate
$\frac{1}{2}$
Z - $\ce{CH3COONa}$/sodium ethanoate/sodium acetate
$\frac{1}{2}$
(ii) Catalyst / dehydrating agent
$\frac{1}{2}$
(iii)
$\ce{CH3-COOH + CH3-CH2OH <=>[Acid] CH3-C-O-CH2-CH3 + H2O}$
• Esterification reaction
$\frac{1}{2}$
• $\ce{CH3COOC2H5 + NaOH -> CH3COONa + C2H5OH}$
1
• Saponification reaction/ De-esterification reaction
$\frac{1}{2}$
5