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प्रश्न
Raina while doing certain reactions observed that heating of substance ‘X’ with a vinegar-like smell with a substance ‘Y’ (which is used as an industrial solvent.) in the presence of conc. Sulphuric acid in a water bath gives a sweet-smelling liquid ‘Z’ having molecular formula C4H8O2. When heated with caustic soda (NaOH), ‘Z’ gives back the sodium salt and the compound ‘Y’.
Identify ‘X’, ‘Y’, and ‘Z’. Illustrate the changes with the help of suitable chemical equations.
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उत्तर
- X - Ethanoic acid/acetic acid/CH3COOH
- Y - Ethanol/Ethyl alcohol/C2H5OH
- Z - Ethyl ethanoate/Ester/CH3COOC2H5
\[\ce{\underset{(Ethanoic acid)}{CH3-COOH} + \underset{(Ethanol)}{CH3 - CH2OH} <=>[Acid]\underset{(Ester)}{CH3-\underset{\overset{11}{O}}{C}-O-CH2-CH3} + H2O}\]
\[\ce{CH3COOC2H5 ->[NaOH]C2H5OH + CH3COONa}\]
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संबंधित प्रश्न
While studying saponification reaction, a student measures the temperature of the reaction mixture and also finds its nature using blue/red litmus paper. On the basis of his observations the correct conclusion would be
(A) the reaction is exothermic and the reaction mixture is acidic.
(B) the reaction is endothermic and the reaction mixture is acidic.
(C) the reaction is endothermic and the reaction mixture is basic.
(D) the reaction is exothermic and the reaction mixture is basic.
Consider the following comments about saponification reactions:
I. Heat is evolved in these reactions.
II. For quick precipitation of soap, sodium chloride is added to the reaction mixtures.
III. Saponification reactions are a special kind of neutralisation reactions.
IV. Soaps are basic salts of long-chain fatty acids.
The correct comments are
(a) I, II and III
(b) II, III and IV
(c) I, II and IV
(d) Only I and IV
Fill in the blanks from the choices given within brackets:
The basicity of acetic acid is-------- (3, 1, 4).
Draw the structure of butanoic acid.
Name one chemical compound which can be used to distinguish between ethanol and ethanoic acid.
Name two oxidising agents which can oxidise ethanol to ethanoic acid.
Write the names of the first three members of the carboxylic acid series.
Give the structural formulae of acetic acid.
What do you notice when acetic acid reacts with metals?
Reshu by mistake forgot to label the two test tubes containing Ethanol and Ethanoic acid. Suggest an experiment to identify the substances correctly? Illustrate the reactions with the help of chemical equations.
