Question 1

What is the product obtained from the reaction between ethene and bromine?

Accepted Answer

1,2-dibromoethane

Answer

1,2-dichloroethane

Answer

2-bromoethanol

Answer

1-bromo-2chloroethane

Question 2

What is the process of making organic compounds from simpler starting materials called?

Accepted Answer

Organic synthesis

Answer

Reduction reaction

Answer

Addition reaction

Answer

Polymerization

Question 3

Which compound is used as a fumigant for treating timber logs against termites and controlling moths in beehives?

Accepted Answer

1,2-dibromoethane

Answer

Chloroethane

Answer

1,2-dichloroethane

Answer

Polythene

Question 4

What is the name of the reaction in which two or more molecules react together to form a single molecule?

Accepted Answer

Addition reaction

Answer

Elimination reaction

Answer

Redox reaction

Answer

Polymerization

Question 5

Which compound is formed when an elimination reaction occurs, leaving a double bond in the larger molecule?

Accepted Answer

Ethene

Answer

1,2-dichloroethane

Answer

Polythene

Answer

1,2-dibromoethane

Question 6

What is the product of the reaction between ethanol and an oxidizing agent such as acidified potassium permanganate?

Accepted Answer

Ethanal

Answer

Propanone

Answer

Ethene

Answer

Ethanoic acid

Question 7

Which compound is commonly referred to as PVC, and is made by reacting together chloroethene molecules?

Accepted Answer

Poly(chloroethene)

Answer

1,2-dibromoethane

Answer

2-bromoethanol

Answer

Poly(propene)

Question 8

What is the name of the reaction in which a small molecule is removed from a larger molecule to leave a double bond?

Accepted Answer

Elimination reaction

Answer

Addition reaction

Answer

Polymerization

Answer

Redox reaction

Question 9

What is the name of the compound formed when ethanoic acid reacts with sodium carbonate, resulting in the production of carbon dioxide?

Accepted Answer

Calcium carbonate

Answer

Magnesium ethanoate

Answer

Sodium benzoate

Answer

Sodium sulfite

Question 10

What is the product formed when ethene reacts with bromine?

Accepted Answer

1,2-dibromoethane

Answer

Chloroethane

Answer

Ethanol

Answer

1,2-dichloroethane

Question 11

What is the definition of an addition reaction?

Accepted Answer

An addition reaction is one in which two or more molecules react together to form a single molecule.

Answer

A reaction where a molecule gains electrons from another molecule.

Answer

An elimination reaction where a small molecule is removed from a larger molecule.

Answer

A reaction in which a molecule is broken down into smaller molecules.

Question 12

What is the name of the intermediate formed in the reaction between ethene and bromine?

Accepted Answer

Carbonium ion

Answer

Hydronium ion

Answer

Bromonium ion

Answer

Chloronium ion

Question 13

What is the purpose of hydrogenation of vegetable oils?

Accepted Answer

To convert unsaturated fats into saturated fats for better spreadability and lower melting points.

Answer

To reduce the shelf life of vegetable oils.

Answer

To enhance the color and flavor of vegetable oils.

Answer

To increase the unsaturation of vegetable oils for health benefits.

Question 14

What is the main function of addition polymers?

Accepted Answer

To join together small molecules to form long chain molecules with repeating patterns.

Answer

To oxidize organic compounds into acids and aldehydes.

Answer

To break down large molecules into smaller molecules.

Answer

To reduce unsaturated fats into saturated fats for health benefits.

Question 15

What is the product formed when ethanal reacts with ammoniacal silver nitrate?

Accepted Answer

Silver mirror

Answer

Yellow gas

Answer

Blue solution

Answer

Red precipitate

Question 16

What is the function of primary alcohols in terms of oxidation with suitable oxidising agents?

Accepted Answer

They are converted to aldehydes.

Answer

They remain unchanged in the reaction.

Answer

They are reduced to form ketones.

Answer

They are converted to carboxylic acids.

Question 17

What is the process called when an atom or group of atoms in a molecule is replaced by another atom or group of atoms in a chemical reaction?

Accepted Answer

Substitution reaction

Answer

Elimination reaction

Answer

Esterification reaction

Answer

Addition reaction

Question 18

What is the mechanism by which a carbonium ion is formed in the reaction between ethene and bromine?

Accepted Answer

A carbonium ion is formed when the Br+ ion attacks the ethene and forms a covalent bond with one of the carbons, resulting in an intermediate with a positive charge

Answer

A carbonium ion is formed when the Br- ion attacks the ethene molecule directly

Answer

A carbonium ion is formed when ethene undergoes heterolytic fission with the Br2 molecule

Answer

A carbonium ion is formed when ethene is polarised by the Br2 molecule

Question 19

What is the purpose of reflux in organic chemistry experiments like the monochlorination of methane?

Accepted Answer

Reflux is necessary to prevent the flask from boiling dry and to allow organic reactions sufficient time to occur

Answer

Reflux helps to speed up the reaction by increasing temperature

Answer

Reflux is used to cool down the reaction mixture quickly

Answer

Reflux is necessary to eliminate impurities from the reaction mixture

Question 20

What is the mechanism behind the formation of an ester in organic chemistry esterification reactions?

Accepted Answer

Esterification is an equilibrium reaction where an alcohol and a carboxylic acid react to form an ester, with the removal of water as a byproduct

Answer

Esterification is a process where two esters react to form a larger ester molecule

Answer

Esterification involves the direct combination of an alcohol and a carboxylic acid without any byproducts

Answer

Esterification is a reaction in which water is added to an alcohol to form a carboxylic acid

Question 21

What is the main function of a base in the saponification process of esters?

Accepted Answer

Bases hydrolyse esters in a saponification reaction, leading to the formation of soap and alcohol

Answer

Bases neutralise the acidic nature of carboxylic acids during the reaction

Answer

Bases catalyse the formation of esters from alcohols and carboxylic acids

Answer

Bases enhance the stability of esters by preventing hydrolysis reactions

Question 22

What is the purpose of adding anti-bumping chips in the preparation of soap through saponification?

Accepted Answer

Anti-bumping chips are added to allow for smooth boiling and prevent the formation of heat pockets, ensuring a consistent reaction mixture

Answer

Anti-bumping chips act as a catalyst to accelerate the saponification process

Answer

Anti-bumping chips help speed up the reaction by increasing the temperature

Answer

Anti-bumping chips are used to neutralize excess base in the reaction mixture

Question 23

What is the purpose of using a base in the acidification step of the production of benzoic acid from phenylmethanol?

Accepted Answer

The base is added to neutralize any excess sodium carbonate and potassium hydroxide in the mixture, ensuring proper acidification of the solution

Answer

The base acts as a catalyst in promoting the formation of benzoic acid from phenylmethanol

Answer

The base helps to speed up the reaction by increasing the temperature of the mixture

Answer

The base assists in separating impurities from the benzoic acid crystals during the process

Question 24

What is the color change observed when ethanal reacts with acidified potassium permanganate?

Accepted Answer

Purple to colourless

Answer

Red to blue

Answer

Orange to pink

Answer

Green to yellow

Question 25

What is the chemical equation for the reaction of ethanal with acidified potassium permanganate?

Accepted Answer

MnO4- + 8H+ + 5e- --> Mn2+ + 4H2O

Answer

2H2O2 --> 2H2O + O2

Answer

C6H12O6 + 6O2 --> 6CO2 + 6H2O

Answer

2HCl + Mg --> MgCl2 + H2

Question 26

What is the role of acidified potassium permanganate in the reaction with ethanal?

Accepted Answer

Oxidizing agent

Answer

Catalyst

Answer

Solvent

Answer

Reducing agent

Question 27

What is the chemical formula of ethanal?

Accepted Answer

C2H4O

Answer

H2O

Answer

CO2

Answer

NH3

Question 28

Why was there no colour change when propanone was used instead of ethanal in the oxidation experiment?

Accepted Answer

Propanone cannot be oxidised to form an acid

Answer

Propanone is a stronger oxidant than ethanal

Answer

The reaction conditions were not suitable for propanone oxidation

Answer

Propanone reacts differently with the oxidising agent

Question 29

What is the chemical formula for ethanoic acid?

Accepted Answer

CH3COOH

Answer

C4H10

Answer

C3H6O

Answer

C2H5OH

Answer

CH4COOH

Question 30

What is the product of the oxidation of ethanal?

Accepted Answer

Ethanoic acid

Answer

Methanol

Answer

Propionic acid

Answer

Ethylene glycol

Question 31

What is the primary difference between ethanal and propanone in terms of their chemical structure?

Accepted Answer

Ethanal has an aldehyde functional group while propanone has a ketone functional group

Answer

Ethanal has two carbon atoms while propanone has three carbon atoms

Answer

Ethanal has a carboxylic acid functional group while propanone has an alcohol functional group

Answer

Ethanal has a double bond while propanone has a triple bond

Question 32

Which statement is true regarding the reaction between ethanal and Fehlings solution?

Accepted Answer

Ethanal has been oxidised by the Fehlings

Answer

Propanone has a blue colour

Answer

Propanone has been oxidised

Answer

The Fehlings solution turns blue in the presence of ethanal

Question 33

What is the result when ethanal is reacted with ammoniacal silver nitrate?

Accepted Answer

A silver mirror forms

Answer

A gold mirror forms

Answer

A red mirror forms

Answer

No change in appearance

Question 34

Why does no colour change occur when propanone is used instead of ethanal in the reaction with Fehlings solution?

Accepted Answer

Ketones are not oxidised

Answer

The Fehlings solution is not working properly

Answer

Propanone is a different color than ethanal

Answer

Propanone reacts with copper differently

Question 35

What is the color change observed when Cu2+ is reduced to Cu+ in the reaction between ethanal and Fehlings solution?

Accepted Answer

Blue to Red

Answer

Yellow to Brown

Answer

Purple to Pink

Answer

Green to Blue

Question 36

What type of organic compound is ethanal?

Accepted Answer

Aldehyde

Answer

Alkane

Answer

Ketone

Answer

Ester

Question 37

How does the Fehlings solution indicate the oxidation of ethanal?

Accepted Answer

The color changes from blue to red

Answer

The solution becomes clear

Answer

Gas bubbles are released

Answer

The temperature increases

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