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Organic Chemistry

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Naming and structural formulae (IUPAC)

Subtopic

Naming and structural formulae (IUPAC) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Based on the pattern of the homologous series shown in the diagram, what is the IUPAC name of the molecule represented by the question mark?

    A.

    Pentane

    B.

    Ethane

    C.

    Butane

    D.

    Propane

  2. 2.

    The molecule CH3CH2OHCH_3CH_2OH contains which functional group?

    A.

    Carboxyl group

    B.

    Carbonyl group

    C.

    Halogen group

    D.

    Hydroxyl group

  3. 3.

    Which of the following represents the general formula for the homologous series of alkenes?

    A.

    CnH2nC_nH_{2n}

    B.

    CnH2n+2C_nH_{2n+2}

    C.

    CnH2n−2C_nH_{2n-2}

    D.

    CnH2n+1OHC_nH_{2n+1}OH

Download the worksheet for Organic Chemistry - Naming and structural formulae (IUPAC) to practice offline. It includes additional chapter-level practice questions.

Homologous series

Subtopic

Homologous series under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    How do the physical properties typically change as the number of carbon atoms in a homologous series increases?

    A.

    The boiling point decreases.

    B.

    The molecules become more volatile.

    C.

    The viscosity decreases.

    D.

    The boiling point increases due to stronger intermolecular forces.

  2. 2.

    By how much does each consecutive member of a homologous series differ from the previous one?

    A.

    A CH2CH_2 group

    B.

    A CH3CH_3 group

    C.

    A CH4CH_4 group

    D.

    A C2H2C_2H_2 group

  3. 3.

    Which of the following is the general formula for the alkane homologous series?

    A.

    CnH2n−2C_n H_{2n-2}

    B.

    CnH2nC_n H_{2n}

    C.

    CnH2n+2C_n H_{2n+2}

    D.

    CnH2n+1C_n H_{2n+1}

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

Alkanes (Substitution reactions)

Subtopic

Alkanes (Substitution reactions) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In the reaction between an alkane and a halogen, which gaseous byproduct is formed alongside the halogenated organic compound?

    A.

    Hydrogen (H2H_{2})

    B.

    Water vapor (H2OH_{2}O)

    C.

    Hydrogen halide (e.g., HClHCl)

    D.

    Carbon dioxide (CO2CO_{2})

  2. 2.

    What is the molecular formula of the organic product formed when one molecule of methane (CH4CH_{4}) undergoes monosubstitution with one molecule of chlorine (Cl2Cl_{2})?

    A.

    CH3ClCH_{3}Cl

    B.

    CH2Cl2CH_{2}Cl_{2}

    C.

    CCl4CCl_{4}

    D.

    CH3Cl2CH_{3}Cl_{2}

  3. 3.

    Which type of reaction takes place when ethane reacts with bromine vapor in the presence of sunlight?

    A.

    Addition

    B.

    Combustion

    C.

    Substitution

    D.

    Polymerization

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

Alkenes (Addition reactions)

Subtopic

Alkenes (Addition reactions) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What type of reaction occurs when a molecule of propene (C3H6C_3H_6) reacts with chlorine gas (Cl2Cl_2) to form 1,2−dichloropropane1,2-dichloropropane?

    A.

    Substitution

    B.

    Combustion

    C.

    Elimination

    D.

    Addition

  2. 2.

    When ethene reacts with steam in the presence of a phosphoric(V) acid catalyst, what is the name of the organic product formed?

    A.

    Ethane

    B.

    Ethanoic acid

    C.

    Ethanol

    D.

    Poly(ethene)

  3. 3.

    What are the essential conditions for the addition reaction between ethene and hydrogen gas (H2H_2) to produce ethane?

    A.

    Nickel catalyst and a temperature of approximately 150∘C150^{\circ}C

    B.

    Iron catalyst and high pressure of 200200 atm

    C.

    Concentrated sulfuric acid and room temperature

    D.

    Ultraviolet (UV) light and a temperature of 450∘C450^{\circ}C

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

Alcohols (Fermentation and hydration)

Subtopic

Alcohols (Fermentation and hydration) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the optimum temperature range for the fermentation of sugar using yeast?

    A.

    0−10∘C0 - 10^\circ C

    B.

    25−35∘C25 - 35^\circ C

    C.

    70−80∘C70 - 80^\circ C

    D.

    300−350∘C300 - 350^\circ C

  2. 2.

    Which catalyst is essential for the industrial production of ethanol by the hydration of ethene?

    A.

    Iron

    B.

    Nickel

    C.

    Phosphoric(V) acid

    D.

    Manganese(IV) oxide

  3. 3.

    During the fermentation of glucose, which gas is released that turns limewater milky?

    A.

    Oxygen

    B.

    Hydrogen

    C.

    Carbon dioxide

    D.

    Nitrogen

Download the worksheet for Organic Chemistry - Alcohols (Fermentation and hydration) to practice offline. It includes additional chapter-level practice questions.

Carboxylic acids (Ethanoic acid)

Subtopic

Carboxylic acids (Ethanoic acid) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Ethanoic acid is described as a 'weak acid'. Which statement correctly explains this term in the context of IGCSE Chemistry?

    A.

    It is very dilute and contains a lot of water.

    B.

    It does not react with metals or carbonates.

    C.

    It only partially dissociates into ions in aqueous solution.

    D.

    It has a pH value of 7 at room temperature.

  2. 2.

    What is the correct molecular formula for ethanoic acid?

    A.

    CH3COOHCH_{3}COOH

    B.

    HCOOHHCOOH

    C.

    C2H5OHC_{2}H_{5}OH

    D.

    C2H6C_{2}H_{6}

  3. 3.

    Ethanoic acid is a common chemical found in the household. What is the name given to a dilute solution of ethanoic acid used in food preservation?

    A.

    Acetone

    B.

    Vinegar

    C.

    Brine

    D.

    Methylated spirit

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

Polymers (Addition and Condensation polymerization)

Subtopic

Polymers (Addition and Condensation polymerization) under Organic Chemistry for Grade 11 IGCSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the primary environmental concern regarding the disposal of non-biodegradable plastics in landfills?

    A.

    They break down quickly into toxic gases

    B.

    They persist in the environment for hundreds of years

    C.

    They release excessive oxygen as they decompose

    D.

    They are easily converted into flammable methane by bacteria

  2. 2.

    Which of these polymers is classified as a polyester?

    A.

    Nylon

    B.

    Poly(ethene)

    C.

    Terylene

    D.

    Protein

  3. 3.

    Addition polymerization occurs when many small molecules join together to form a long chain. What is a characteristic feature of the monomers involved in this process?

    A.

    They contain only single bonds

    B.

    They contain at least one carbon-carbon double bond

    C.

    They must have two different functional groups at each end

    D.

    They are always saturated hydrocarbons

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

Organic Chemistry - Grade 11 Chemistry (IGCSE) | Krit.club