Oxidation

Q.

When ethanol is heated with alkaline potassium permanganate solution, it gets converted into ethanoic acid. In this reaction, alkaline potassium permanganate acts as :
(a) reducing agent (b) oxidising agent (c) catalyst (d) dehydrating agent

Q. Question 6
${\text{CH}}_3-{\text{CH}}_2-\text{OH}\stackrel{{\text{Alkaline KMnO}}_4+\text{Heat}}{\to }{\text{CH}}_3-\text{COOH}$
In the above-given reaction, alkaline ${\text{KMnO}}_4$ acts as
(a) reducing agent
(b) oxidising agent
(c) catalyst
(d) dehydrating agent

Q. Ethanol on complete oxidation gives __________.

1. acetaldehyde
2. acetic acid
3. acetone
4. carbon dioxide

Q. Question 3.2

Identify the substance that is oxidized and the substance that is reduced in the following reaction:

$\text{CuO(s)}+{\text{H}}_2\text{(g)}\to \text{Cu(s)}+{\text{H}}_2\text{O(l)}$

Q.

Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?

1. $C{H}_{4}and{C}_2{H}_6$

2. $C_2{H}_{6}Oand{C}_3{H}_{8}O$

3. $C_2{H}_4{O}_{2}and{C}_3{H}_{6}O$

4. $C_2{H}_{2}and{C}_3{H}_6$

Q.

Ethanol can be oxidised to ethanoic acid. Write the equation and name the oxidising agent.

Q. Question 3.1
Identify the substance that is oxidized and the substance that is reduced in the following reaction:

$4\text{Na (s)}+{\text{O}}_2\text{(g)}\to 2{\text{Na}}_2\text{O(s)}$

Q. An organic compound 'X' with molecular formula C2H6O, on oxidation with acidified potassium dichromate gives ethanoic acid. What is the compound 'X'?

Q.

Write the equation for the preparation of carbon tetrachloride from methane.

Q.

What is dehydration of alcohol?

Q.

Define : Oxidation.

Q.

When ethanol is heated at 443 K with excess concentrated sulphuric acid it gives:

1. Ethanoic acid

2. Ethene

3. Ethyl Ethanoate

4. Methanoic acid

Q.

Name the product formed when Ethanol is oxidized using alkaline Potassium Permanganate.

Q.

73. Give the corresponding functional isomer of the product formed when ethanol is treated with ethanoic acid.

1. propanoic acid

2. ethyl ethanoate

3. butanoic acid

4. butanone

Q.

Alkaline Potassium permanganate and Potassium dichromate convert alcohol into carboxylic acids by adding oxygen.

1. False

2. True

Q.

The reaction in which oxidising agents supply nascent oxygen for oxidation of alcohols to their respective acids is known as:

1. Combustion reaction

2. Substitution reaction

3. Addition reaction

4. Oxidation reaction

Q.

Name the product formed when ethanol reacts with acetic acid. Write the chemical equation for this reaction.

Q. Choose the correct word/phrase from within the brackets to complete the following sentences:
(i) The catalyst used for conversion of ethene to ethane is commonly __________ (nickel/iron/cobalt).
(ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms _________ (ester/ethanol/acetic acid).
(iii) Ethanoic acid reacts with ethanol in presence of concentrated H₂SO₄, so as to form a compound and water. The chemical reaction which takes place is called __________ (dehydration/hydrogenation/esterification).
(iv) Write the equation for the reaction taking place between 1, 2-dibromoethane and alcoholic potassium hydroxide.
(v) The product formed when ethene gas reacts with water in the presence of sulphuric acid is ________ (ethanal/ethanol/ethanoic acid).

Q.

The substances which are capable of adding oxygen to other substances are called:

1. Normalizing agents

2. Reducing agents

3. Oxidizing agents

4. Antioxidants

Q.

An organic compound A has the molecular formula ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$. On oxidation in air in the presence of heated Copper as catalyst, it is oxidized to ${\mathrm{CH}}_3\mathrm{COOH}$. What is the compound A? Give equation for the reaction.

Q.

What happens when ethanol

i)is burnt in air and ii)it is oxidized with equations

Q.

Carboxylic acids are obtained from alcohols by ____

1. Oxidation

2. Reduction

3. Hydrolysis

4. Pyrolysis

Q.

Ethanol on oxidation gives

1. Ethane

2. Formalin

3. Ethanoic acid

4. Methane

Q.

Carboxylic acids are obtained from alcohols by -

1. Oxidation

2. Reduction

3. Hydrolysis

4. Pyrolysis

Q. Question 56

Explain the given reaction with examples:

(a) Hydrogenation
(b) Oxidation
(c) Substitution
(d) Saponification
(e) Combustion

Q.

Identify A and B in the following reaction.
$C{H}_{3}C{H}_{2}OH+O_2\to A+B+Heatandlight$

1. $C{H}_{4}and{H}_2$

2. $Cand{H}_{2}O$

3. $Cand{H}_2$

4. $C{O}_{2}and{H}_{2}O$

Q. Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH₂Br − CH₂Br.

Q. Which of the given reagents is used to convert ethanol to ethanoic acid?

1. Lithium aluminium hydride
2. $NaOH$
3. $\text{Conc.}HN{O}_3$
4. $\text{Acidified}{K}_{2}C{r}_2{O}_7$

Q. Alkaline potassium permanganate and potassium dichromate convert alcohols into carboxylic acids on oxidation.

1. True
2. False

Q.

A _______ is a substance that changed the rate of chemical reaction without itself undergoing any chemical change.