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.Define the term isomerism and select the option that correctly identifies its two main causes.
- A.Isomerism is the phenomenon where compounds have the same molecular formula but different structural or spatial arrangements. Causes: (1) Different arrangement of atoms, (2) Different spatial arrangement of atoms.
- B.Isomerism is the phenomenon where compounds have different molecular formulas but similar structures. Causes: (1) Different functional groups, (2) Different carbon chain lengths.
- C.Isomerism is the phenomenon where compounds have the same molecular formula but identical structures. Causes: (1) Same arrangement of atoms, (2) Same spatial orientation.
- D.Isomerism is the phenomenon where compounds have the same molecular formula but different properties. Causes: (1) Different molecular weights, (2) Different physical states.
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2.Which equation represents the preparation of ethylene from ethyl alcohol using concentrated sulfuric acid?
- A.C₂H₅OH → C₂H₄ + H₂O (Conc. H₂SO₄, 160-170°C)
- B.C₂H₅OH + O₂ → C₂H₄ + H₂O₂
- C.2C₂H₅OH → C₄H₈ + 2H₂O
- D.C₂H₅OH + H₂SO₄ → C₂H₅HSO₄ + H₂O
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3.Which of the following forms a homologous series?
- A.Butane, 2-methylbutane, 2, 3-dimethylbutane
- B.Ethane, propane, butanone
- C.Methanol, ethanol, propanoic acid
- D.Ethane, ethylene, acetylene
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4.Write the IUPAC name of the following compound: ``` CH3 - C - CH2 - CH2 - CH3 || O ```
- A.Pentan-2-one
- B.Pentan-3-one
- C.2-Pentanone
- D.Propan-2-one
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5.In the diagram of the methane molecule shown below, which labelled part correctly represents the tetrahedral arrangement of hydrogen atoms around the central carbon atom?
- A.A flat square with carbon at the center and hydrogens at the corners
- B.A pyramid shape with carbon at the apex and hydrogens at the base
- C.A three-dimensional tetrahedron with carbon at the center and hydrogens at the vertices
- D.A linear chain with carbon in the middle and hydrogens on either side
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