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प्रश्न
Describe a test for carboxylic acid.
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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
Fill in the blanks from the choices given within brackets:
The basicity of acetic acid is-------- (3, 1, 4).
Give the common names and IUPAC names of the following compounds of HCOOH.
When ethanoic acid reacts with sodium hydrogen carbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas. Y Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.
Esters are sweet-smelling substances and are used in making perfumes. Describe an activity for the preparation of an ester with the help of a well labelled diagram. Write an equation for the chemical reaction involved in the formation of the ester. Also write the names of all the substances involved in the process of esterification.
If you take a pinch of sodium hydrogen carbonate powder in a test-tube and add drop-by-drop acetic acid to it, what would you observe immediately? List any two main observations.
A student is studying the properties of acetic acid in his school laboratory. List two physical and two chemical properties which he must observe and note in his record book.
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
Give the structural formula of Acetic acid.
Fill in the blank with appropriate word/words.
Vinegar is a solution of about ________per cent ________in water.
Draw the structural formula of a compound with two carbon atoms in the following case:
An alcohol containing two carbon atoms.
Using appropriate catalysts, ethane can be oxidized to an alcohol. Name the alcohol formed when ethane is oxidized.
The functional group present in acetic acid is ______.
State the observation
When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.
Give balanced chemical equations for the following conversion :
Ethanoic acid to ethyl ethanote
When sodium hydrogen carbonate is added to ethanoic acid, a gas evolves. Consider the following statements about the gas evolved.
- It turns lime water milky.
- It is evolved with brisk effervescence.
- It has a smell of burning sulfur.
- It is also a by-product of respiration.
Ketone : –CO– : : Ester : _______
Write the molecular formula of the given compound.
Sodium ethanoate
Give a chemical reaction in which a catalyst is used.
Shristi heated Ethanol with a compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet smelling compound B is formed. When B is treated with sodium hydroxide it gives back Ethanol and a compound C.
- Identify A and C
- Give one use each of compounds A and B.
- Write the chemical reactions involved and name the reactions.
