Organic Chemistry Grade 12 Worksheet with Answers & Notes

Nomenclature and homologous series

Subtopic

Nomenclature and homologous series under Organic Chemistry for Grade 12 IGCSE.

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1.
$Members of the same homologous series have the same:$
A. $Molecular formula$
B. $Empirical formula$
C. $Functional group$
D. $Physical state$
2.
$What is the name of the alkene that contains three carbon atoms?$
A. $Ethene$
B. $Propene$
C. $Butene$
D. $Pentene$
3.
$Which of the following formulas represents an alcohol?$
A. $C_{2}H_{6}$
B. $C_{2}H_{4}$
C. $C_{2}H_{5}OH$
D. $CH_{3}COOH$
4.
$What is the name of the fourth member of the alkane series?$
A. $Propane$
B. $Butane$
C. $Pentane$
D. $Hexane$
5.
$Which of the following alcohols is the most soluble in water?$
A. $Methanol$
B. $Ethanol$
C. $Propan-1-ol$
D. $Butan-1-ol$
6.
$CH_{3}CH=CHCH_{3}$
A. $But-1-ene$
B. $But-2-ene$
C. $Methylpropene$
D. $Cyclobutene$
7.
$Which general formula applies to the homologous series of cycloalkanes?$
A. $C_{n}H_{2n+2}$
B. $C_{n}H_{2n}$
C. $C_{n}H_{2n-2}$
D. $C_{n}H_{n}$
8.
$CH_{3}CH(CH_{3})CH_{2}CH_{2}CH(CH_{3})_{2}$
A. $2,5-dimethylhexane$
B. $Isooctane$
C. $1,1,4,4-tetramethylbutane$
D. $2,5-dimethylheptane$
9.
$Which molecular formula could represent both an alkene and a cycloalkane?$
A. $C_{3}H_{8}$
B. $C_{3}H_{6}$
C. $C_{3}H_{4}$
D. $C_{4}H_{10}$
10.
$What is the name for a carboxylic acid with 6 carbon atoms in a straight chain?$
A. $Hexanoic acid$
B. $Heptanoic acid$
C. $Pentanoic acid$
D. $Hexanal$

Download the worksheet for Organic Chemistry - Nomenclature and homologous series to practice offline. It includes additional chapter-level practice questions.

Alkanes

Subtopic

Alkanes under Organic Chemistry for Grade 12 IGCSE.

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1.
$CH_3\cdot$
A. $Methyl radical$
B. $Methyl ion$
C. $Methane molecule$
D. $Carbocation$
2.
$Why do alkanes not mix with water?$
A. $They are polar$
B. $They are non-polar$
C. $They are too heavy$
D. $They react with water$
3.
$In organic chemistry, which prefix is used to denote a chain of five carbon atoms?$
A. $But-$
B. $Hex-$
C. $Pent-$
D. $Prop-$
4.
$How many total carbon atoms are found in one molecule of 2-methylpropane?$
A. $3$
B. $4$
C. $5$
D. $6$
5.
$In a catalytic cracking reaction, a single molecule of an unknown alkane is broken down into exactly three smaller molecules as shown in the diagram. Based on the products formed, what is the IUPAC name of the original alkane?$
A. $Heptane$
B. $Octane$
C. $Nonane$
D. $Decane$
6.
$CH_3C(CH_3)_2CH_3$
A. $2,2-dimethylpropane$
B. $2-methylbutane$
C. $Pentane$
D. $Tetramethylmethane$
7.
$Which of the following statements about the chemical reactivity of alkanes is true?$
A. $They react readily with acids and bases$
B. $They are generally unreactive except for combustion and substitution$
C. $They undergo addition reactions with halogens in the dark$
D. $They are easily oxidized by potassium manganate(VII)$
8.
$What happens to the temperature of the surroundings during the combustion of an alkane?$
A. $It decreases because the reaction is endothermic.$
B. $It increases because the reaction is exothermic.$
C. $It remains constant as energy is conserved within the bonds.$
D. $It increases first and then decreases.$
9.
$Which alkane has the highest boiling point?$
A. $2,2,3,3-tetramethylbutane$
B. $Octane$
C. $2-methylheptane$
D. $2,2-dimethylhexane$
10.
$In the fractional distillation of crude oil, which fraction is most likely used as aviation fuel (jet fuel)?$
A. $Refinery gas$
B. $Gasoline$
C. $Kerosene$
D. $Diesel$

Download the worksheet for Organic Chemistry - Alkanes to practice offline. It includes additional chapter-level practice questions.

Alkenes

Subtopic

Alkenes under Organic Chemistry for Grade 12 IGCSE.

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1.
$Which of the following compounds will react with iodine in an addition reaction?$
A. $Methane$
B. $Ethane$
C. $Propene$
D. $Propane$
2.
$C_4H_8$
A. $1$
B. $2$
C. $3$
D. $4$
3.
$When ethene burns in a limited supply of air, it burns with a sooty flame. What causes the soot?$
A. $Unburnt carbon$
B. $Carbon dioxide$
C. $Water vapor$
D. $Nitrogen$
4.
$Which of these alkenes has the highest boiling point?$
A. $Ethene$
B. $Propene$
C. $Butene$
D. $Pentene$
5.
$What is the total number of atoms in one molecule of hex-1-ene?$
A. $6$
B. $12$
C. $18$
D. $20$
6.
$CH_3C(CH_3)=CHCH_3$
A. $2-methylbut-2-ene$
B. $3-methylbut-2-ene$
C. $Pent-2-ene$
D. $2,2-dimethylpropene$
7.
$Which statement about addition polymers is correct?$
A. $They are easily broken down by bacteria (biodegradable).$
B. $They are formed by the reaction of alkanes.$
C. $They contain only single bonds in the polymer chain backbone.$
D. $They have the same empirical formula as the monomer.$
8.
$20$
A. $C_2H_4$
B. $C_4H_8$
C. $C_3H_6$
D. $C_5H_{10}$
9.
$Which of the following is the product of the reaction between ethene and chlorine gas in the presence of aqueous sodium chloride solution?$
A. $1,2-dichloroethane$
B. $1-chloro-2-hydroxyethane$
C. $A mixture of 1,2-dichloroethane and 1-chloro-2-hydroxyethane$
D. $Chloroethene$
10.
$A section of an addition polymer is shown. Which of the following is the correct monomer?$
A. $CH_2=CH(C_6H_5)$
B. $CH(C_6H_5)=CH(C_6H_5)$
C. $CH_3-C(C_6H_5)=CH_2$
D. $CH_2=C(C_6H_5)_2$

Download the worksheet for Organic Chemistry - Alkenes to practice offline. It includes additional chapter-level practice questions.

Alcohols

Subtopic

Alcohols under Organic Chemistry for Grade 12 IGCSE.

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1.
$In a homologous series of alcohols, by what mass and group does each member differ from the next?$
A. $CH_2$
B. $O$
C. $H$
D. $C$
2.
$What type of intermolecular force is primarily responsible for the higher boiling points of alcohols compared to alkanes?$
A. $Ionic bonding$
B. $Hydrogen bonding$
C. $Metallic bonding$
D. $Van der Waals forces only$
3.
$How many hydrogen atoms are in a molecule of pentan-1-ol?$
A. $10$
B. $11$
C. $12$
D. $13$
4.
$Which alcohol is commonly used as a solvent in perfumes and cosmetics?$
A. $Methanol$
B. $Ethanol$
C. $Hexanol$
D. $Decanol$
5.
$What is the primary reason why fermentation stops before the glucose is completely used up in some industrial processes?$
A. $The yeast runs out of nutrients.$
B. $The concentration of ethanol becomes toxic to the yeast.$
C. $The temperature rises too high and kills the yeast.$
D. $The carbon dioxide pressure becomes too high.$
6.
$Which of the following would produce but-1-ene as a product upon dehydration?$
A. $Butan-1-ol$
B. $2-methylpropan-2-ol$
C. $Ethanol$
D. $Methanol$
7.
$C_2H_5OH$
A. $34.8%$
B. $52.2%$
C. $13.0%$
D. $16.0%$
8.
$A student reacted 0.1 mol of an alcohol with an excess of ethanoic acid and obtained 6.0 g of an ester. If the yield was 60%, what is the molar mass of the ester?$
A. $g/mol$
B. $g/mol$
C. $g/mol$
D. $g/mol$
9.
$Which of the following alcohols is most likely to be a solid at room temperature?$
A. $Propan-1-ol$
B. $Decan-1-ol$
C. $Hexan-1-ol$
D. $Octan-1-ol$
10.
$In the industrial hydration of ethene, what is the effect of using a high pressure on the position of equilibrium and the rate of reaction?$
A. $Equilibrium shifts right; rate increases$
B. $Equilibrium shifts left; rate increases$
C. $Equilibrium shifts right; rate decreases$
D. $Equilibrium shifts left; rate decreases$

Download the worksheet for Organic Chemistry - Alcohols to practice offline. It includes additional chapter-level practice questions.

Carboxylic acids

Subtopic

Carboxylic acids under Organic Chemistry for Grade 12 IGCSE.

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1.
$HCOOH$
A. $Formic acid$
B. $Ethanoic acid$
C. $Methanoic acid$
D. $Carbonic acid$
2.
$What is the result of the reaction between Zinc and ethanoic acid?$
A. $Zinc ethanoate and hydrogen$
B. $Zinc ethanoate and water$
C. $Zinc oxide and ethane$
D. $No reaction$
3.
$Which ion is produced by all carboxylic acids when they dissociate in water?$
A. $OH^-$
B. $H^+$
C. $Na^+$
D. $CO_3^{2-}$
4.
$Which carboxylic acid has the highest boiling point among the following?$
A. $Methanoic acid$
B. $Ethanoic acid$
C. $Propanoic acid$
D. $Butanoic acid$
5.
$When comparing ethanoic acid and propanoic acid, which statement is true?$
A. $Ethanoic acid has a higher boiling point than propanoic acid$
B. $Propanoic acid is more soluble in water than ethanoic acid$
C. $Ethanoic acid is a stronger acid than propanoic acid due to a smaller inductive effect from the alkyl group$
D. $Propanoic acid reacts faster with magnesium$
6.
$Which compound is produced when 2-methylpropan-1-ol is completely oxidized?$
A. $2-methylpropanoic acid$
B. $Butanoic acid$
C. $Methylpropanoic acid$
D. $2-methylpropanal$
7.
$Which of these carboxylic acids would be expected to have the highest solubility in water?$
A. $Butanoic acid$
B. $Propanoic acid$
C. $Ethanoic acid$
D. $Methanoic acid$
8.
$Which of the following carboxylic acids is a solid at room temperature?$
A. $Methanoic acid$
B. $Ethanoic acid$
C. $Propanoic acid$
D. $Benzoic acid$
9.
$The boiling point of carboxylic acids is higher than that of alkanes with similar molecular mass because of:$
A. $Stronger London dispersion forces$
B. $The presence of permanent dipole-dipole interactions only$
C. $Extensive intermolecular hydrogen bonding$
D. $The formation of covalent bonds between molecules$
10.
$^{18}O$
A. $Only in the water molecule$
B. $Only in the ester molecule$
C. $Distributed equally between the ester and water$
D. $In the methyl group of the ester$

Download the worksheet for Organic Chemistry - Carboxylic acids to practice offline. It includes additional chapter-level practice questions.

Polymers (Addition and Condensation)

Subtopic

Polymers (Addition and Condensation) under Organic Chemistry for Grade 12 IGCSE.

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1.
$If a polymer has a backbone consisting of alternating carbon and oxygen atoms, it is most likely a:$
A. $Polyalkene$
B. $Polyester$
C. $Poly(ethene)$
D. $Poly(chloroethene)$
2.
$Which statement about addition polymers is correct?$
A. $They are usually biodegradable$
B. $They are formed from unsaturated monomers$
C. $They contain amide linkages$
D. $They release water during formation$
3.
$Which polymer is formed by the condensation of many glucose units?$
A. $Protein$
B. $Starch$
C. $Nylon$
D. $Terylene$
4.
$What is the result of many propene molecules joining together?$
A. $Poly(ethene)$
B. $Poly(propene)$
C. $Propane$
D. $Polyester$
5.
$Which of the following monomers can undergo addition polymerization?$
A. $CH_3CH=CH_2$
B. $CH_3CH_2CH_3$
C. $CH_3CH_2OH$
D. $CH_3COOH$
6.
$Why does poly(ethene) have a higher melting point than the ethene monomer?$
A. $The polymer molecules are much larger, leading to stronger van der Waals forces between chains.$
B. $The polymer contains covalent bonds between the chains, unlike the monomer.$
C. $The polymer contains ionic bonds, while the monomer only has covalent bonds.$
D. $The polymer molecules are branched, allowing them to pack more tightly.$
7.
$What is the primary product formed when methyl 2-methylpropenoate is polymerized?$
A. $Poly(methyl methacrylate)$
B. $Poly(methyl propanoate)$
C. $Poly(ethene)$
D. $Poly(vinyl acetate)$
8.
$Deduce the monomer for a polymer that has a repeat unit containing four carbon atoms in a straight chain with a double bond between the second and third carbons.$
A. $Buta-1,3-diene$
B. $But-2-ene$
C. $Ethene$
D. $Cyclobutene$
9.
$NaOH$
A. $A thermosetting polyester$
B. $A thermoplastic polyester$
C. $A thermosetting polyamide$
D. $A thermoplastic polyamide$
10.
$Which statement regarding the disposal of polymers is correct?$
A. $CO_{2}$
B. $Condensation polymers should be disposed of in landfills because they never degrade.$
C. $Recycling polymers is difficult because different types must be separated to prevent contamination of the new product.$
D. $Addition polymers can be easily broken down into monomers by heating with dilute acid.$

Download the worksheet for Organic Chemistry - Polymers (Addition and Condensation) to practice offline. It includes additional chapter-level practice questions.

Organic Chemistry

Nomenclature and homologous series

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Alkanes

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Alkenes

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Alcohols

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Carboxylic acids

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Polymers (Addition and Condensation)

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