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प्रश्न
Explain the following term with example.
Reduction
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उत्तर
A chemical reaction in which a substance gains hydrogen or loses oxygen is called a reduction reaction.
E.g. In the following reaction, ethylene (ethene) is reduced to ethane.
\[\ce{\underset{\text{Ethylene}}{H2C = CH2} ->[H2][Pt/Ni] \underset{\text{Ethane}}{CH3CH3}}\]
संबंधित प्रश्न
A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:
(a) There is no change in the blue litmus paper and the red litmus paper turns white.
(b) There is no change in the red litmus paper and the blue litmus paper turns red.
(c) There is no change in the blue litmus paper and the red litmus paper turns blue.
(d) No change in colour is observed in both the litmus papers
When ethanol reacts with ethanoic acid in the presence of conc. H2SO4, a substance with fruity smell is produced. Answer the following:-
(i) State the class of compounds to which the fruity smelling compounds belong. Write the chemical equation for the reaction and write the chemical name of the product formed.
(ii) State the role of conc. H2SO4 in the reaction.
Write the name and chemical formula of the simplest organic acid.
Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas?
The structural formula of an ester is :
Write the formula of the acid and the alcohol from which it is formed.
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?
Give two tests to show that CH3COOH is acidic in nature ?
A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations:
I. A colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought near it.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observations are:
(A) I, II, and III
(B) II, III and IV
(C) III, IV and I
(D) IV, I and II
Acetic acid smells like:
(1) a banana
(2) vinegar
(3) an orange
(4) a lemon
What is thr boilng point of acetic acid?
Draw the structural formula of a compound with two carbon atoms in the following case:
An alkane with a carbon to carbon single bond.
Write a balanced chemical equation for the following:
Monochloroethane is hydrolysed with aqueous KOH.
State the observation
When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.
State are relevant observations for following reactant:
Addition of ethyl alcohol to acetic acid in presence of conc. H2SO4
Identify the term or substance based on the descriptions given below:
Ice like crystals formed on cooling an organic acid sufficiently.
Ethanoic acid _________.
Ketone : –CO– : : Ester : _______
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
