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प्रश्न
Describe a test for carboxylic acid.
उत्तर
Carboxylic acids react with sodium bicarbonate to form Sodium ethanoate and water along with carbon dioxide, which produces effervescence in the reaction mixture. This reaction is used as a test for the presence of carboxylic acids.
`CH_3 COOH + NaHCO_3 -> CH_3 COONa + CO_2 + H_2O`
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संबंधित प्रश्न
Describe one reaction of a carboxylic acid.
An organic acid X is a liquid, which often freezes during winter time in cold countries, having the molecular formula C2H4O2. On warming it with methanol in the presence of a few drops of concentrated sulphuric acid, a compound Y with a sweet smell is formed.
(a) Identify X and Y. Also write their formulae showing the functional group present in them.
(b) Write a chemical equation for the reaction involved.
If you are asked to report your observations about the following two properties of acetic acid, what would you report?
(i) Odour
(ii) Effect on litmus
In an experiment to study the properties of acetic acid a student takes about 2 mL of acetic acid in a dry test tube. He adds about 2 mL of water to it and shakes the test tube well. He is likely to observe that:
(A) the acetic acid dissolves readily in water
(B) the solution becomes light orange
(C) water floats over the surface of acetic acid
(D) acetic acid floats over the surface of water
On adding NaHCO3 to acetic acid, a gas is evolved which turns lime water milky due to the formation of:
(1) Calcium bicarbonate
(2) Calcium hydroxide
(3) Calcium carbonate
(4) Calcium acetate
Fill in the blank with appropriate word/words.
Esterification is the reaction between carboxylic acid and ______ in presence of ____
Draw the structural formula for the following:
Ethanoic acid
Ketone : –CO– : : Ester : _______
Ester is a sweet-smelling compound.
Explain the following reaction with an example.
Saponification
