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Why carbon forms neither C4+ nor C4- ions

This type of question, asked 5 times: 2022, 2023, 2024, 2025, 2026. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2022

    11 OR
    State the reasons, why carbon cannot (i) Lose four electrons to form C4+\mathrm{C^{4+}} cation, and (ii) Gain four electrons to form C4−\mathrm{C^{4-}} anion. How does carbon overcome this problem to form compounds ?

  2. Question 2

    2023

    36 (A)
    (i) It is observed that covalent compounds are bad conductors of electricity. Give reason. (ii) Carbon can neither form C4+\mathrm{C^{4+}} cation nor C4−\mathrm{C^{4-}} anion. Why ? (iii) Draw electron dot structure of Ethanol. (iv) Identify hetero atom(s) in the following compounds : (a) CH3CH2COCH3\mathrm{CH_3CH_2COCH_3} (b) CH3CH2Cl\mathrm{CH_3CH_2Cl}

  3. Question 3

    2024

    34 (a)
    (i) Give reason why carbon can neither form C4+\mathrm{C^{4+}} cations nor C4−\mathrm{C^{4-}} anions but form covalent compounds. (ii) What is homologous series of carbon compound ? Write the molecular formula of any two consecutive members of homologous series of aldehydes. (iii) Draw the structure of the molecule of cyclohexane (C6H12)(\mathrm{C_6H_{12}}).

  4. Question 4

    2025

    34 (B)
    (i) Give reason why carbon can neither form C4+\mathrm{C^{4+}} cations nor C4−\mathrm{C^{4-}} anions but forms covalent compounds. (ii) What is meant by functional group in carbon compounds ? Write in tabular form the structural formula and the functional group present in the following compounds : (a) Ethanol (b) Ethanoic acid

  5. Question 5

    2026

    29 (A)
    (i) Carbon cannot form C4+\mathrm{C^{4+}} cation and C4−\mathrm{C^{4-}} anion. Explain. (ii) Define homologous series of carbon compounds. Why are the melting and boiling points of C4H10\mathrm{C_4H_{10}} higher than C3H8\mathrm{C_3H_8} or C2H6\mathrm{C_2H_6} ? (iii) What happens when ethanol is heated with acidified potassium dichromate ?