PYQ Vault
EbooksTutor

Draw the two structural isomers of butane (two four-carbon skeletons)

The same question, asked 3 times: 2022*, 2023*, 2025. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2022

    9 (a)
    Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are these two structures of the hydrocarbon having same molecular formula called ? Write the molecular formula and the common name of this compound. Also write the molecular formula of its alkyne.

  2. Question 2

    2023

    36 (B)
    (i) Draw two structural isomers of butane. (ii) Draw the structures of propanol and propanone. (iii) Name the third homologue of : (a) alcohols (b) aldehydes (iv) Name the following : (a) the structure drawn in the attached figure (b) CH3−CH2CH=CH2\mathrm{CH_3-CH_2CH=CH_2} (v) Show the covalent bond formation in nitrogen molecule.

  3. Question 3

    2025

    7
    If we make carbon skeleton with four carbon atoms, the two different possible skeletons will be

    Tap an option to check your answer.

  4. Question 4

    2025

    35 (b)
    (a) Define the term “structural isomers”. Write the structures of two isomers of butane (C4H10)(\mathrm{C_4H_{10}}). (b) Two carbon compounds X and Y have the molecular formula C2H4\mathrm{C_2H_4} and C3H8\mathrm{C_3H_8} respectively. Which one of the two is most likely to show addition reaction ? Justify your answer. Also give (i) chemical equation to explain the process of addition reaction in this case and (ii) name of the industry where this reaction is applied.

  5. Question 5

    2025

    34 (A)
    (i) What are structural isomers ? Draw structural isomers of butane (C4H10)(\mathrm{C_4H_{10}}). Give reason why propane has no structural isomers ? (ii) What happens when butane is burnt in air ? Write chemical equation for the reaction. Differentiate between the flames obtained when butane and butyne both are burnt in air in the similar conditions.