ICSE Class 10 Organic Chemistry — Mock Test (2027)
Free online mock test for Organic Chemistry (ICSE Class 10 Chemistry) — 20 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.
What to expect: This mock test covers key concepts from the Organic Chemistry chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Classify each of the following compounds as an alkane, alkene, or alkyne: C₃H₄, C₃H₈, C₅H₈, C₃H₆. Which of the following correctly represents their classifications?
- A.C₃H₄: Alkane, C₃H₈: Alkene, C₅H₈: Alkyne, C₃H₆: Alkane
- B.C₃H₄: Alkyne, C₃H₈: Alkane, C₅H₈: Alkyne, C₃H₆: Alkene
- C.C₃H₄: Alkene, C₃H₈: Alkane, C₅H₈: Alkane, C₃H₆: Alkyne
- D.C₃H₄: Alkyne, C₃H₈: Alkene, C₅H₈: Alkene, C₃H₆: Alkane
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2.In the following reaction sequence, identify the correct formulas and names for A, B, C, and D: C₂H₂ → (H₂) A → (H₂) B → (Br₂, -HBr) C → (Br₂, -HBr) D.
- A.A: C₂H₄ (Ethene), B: C₂H₆ (Ethane), C: C₂H₄Br₂ (1,2-Dibromoethane), D: C₂H₄Br₄ (1,1,2,2-Tetrabromoethane)
- B.A: C₂H₆ (Ethane), B: C₂H₄ (Ethene), C: C₂H₃Br (Bromoethene), D: C₂H₂Br₄ (1,1,2,2-Tetrabromoethane)
- C.A: C₂H₄ (Ethene), B: C₂H₆ (Ethane), C: C₂H₃Br (Bromoethene), D: C₂H₂Br₂ (1,2-Dibromoethene)
- D.A: C₂H₂ (Ethyne), B: C₂H₄ (Ethene), C: C₂H₄Br₂ (1,2-Dibromoethane), D: C₂H₃Br₃ (1,1,2-Tribromoethane)
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3.Which of the following correctly describes the Wurtz reaction for the preparation of ethane, including its chemical equation and limitations?
- A.The reaction couples methyl iodide using sodium in dry ether to form ethane: $$2\mathrm{CH_3I + 2Na \xrightarrow[dry]{ether} H_3C-CH_3 + 2NaI}$$. It cannot prepare methane or alkanes with an odd number of carbon atoms.
- B.The reaction involves the substitution of iodine in methyl iodide with sodium to form ethane: $$\mathrm{CH_3I + Na \rightarrow CH_4 + NaI}$$. It is limited to alkanes with an even number of carbon atoms.
- C.The reaction couples alkyl halides using sodium in water to form ethane: $$2\mathrm{CH_3Br + 2Na \rightarrow H_3C-CH_3 + 2NaBr}$$. It cannot prepare alkanes with fewer than three carbon atoms.
- D.The reaction involves the addition of sodium to methyl iodide to form ethane: $$\mathrm{CH_3I + 2Na \rightarrow CH_3-CH_3 + NaI}$$. It is suitable for preparing all alkanes, including methane.
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4.How are aldehydes named according to IUPAC nomenclature?
- A.By replacing the '-e' of the alkane with '-al' to form alkanals.
- B.By adding the prefix 'aldo-' to the name of the alkane.
- C.By replacing the '-e' of the alkane with '-one' to form alkanones.
- D.By using the suffix '-oic acid' after the alkane name.
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5.Which of the following correctly lists the physical properties of ethane?
- A.Ethane is a colourless, odourless, tasteless, and non-poisonous gas with a boiling point of -89°C and melting point of -172°C, sparingly soluble in water but soluble in organic solvents.
- B.Ethane is a coloured, pungent-smelling gas with a boiling point of 0°C, highly soluble in water but insoluble in organic solvents.
- C.Ethane is a liquid at room temperature, poisonous, and completely soluble in water but insoluble in organic solvents.
- D.Ethane is a solid with a melting point of 100°C, odourless, and soluble only in water due to strong hydrogen bonding.
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