COMEDK 2025 Afternoon Shift | Hydrocarbons Question 10 | Chemistry

When one mole of a hydrocarbon $\mathbf{C}_{\mathbf{a}} \mathbf{H}_{\mathbf{b}}$ undergoes complete combustion, it requires 7.5 moles of $\mathrm{O}_2$ and results in the production of 6 moles of $\mathrm{CO}_2$. Calculate the values of $\mathbf{a}$ and $\mathbf{b}$.

$a=4$ and $b=10$

$a=6$ and $b=6$

$a=6$ and $b=12$

$a=4$ and $b=8$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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An unsaturated hydrocarbon $[\mathrm{A}]$ undergoes the following series of reactions. Identify $[\mathrm{A}]$.

COMEDK 2025 Morning Shift Chemistry - Hydrocarbons Question 11 English

Propyne

But-2-yne

But-1-yne

But-2-ene

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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Which one of the following statements is correct?.

The major product formed when 2- Methylpropene reacts with dilute $\mathrm{H}_2 \mathrm{SO}_4$ is tert. butyl alcohol.

The Electrophilic addition to an unsymmetrical alkene always occurs through the formation of a more stable Carbanion intermediate.

Between the two alkenes - (i) $\left(\mathrm{CH}_3\right)_2-\mathrm{C}=\mathrm{CH}-\mathrm{CH}_3$ and (ii). $\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}_3$, compound (i) will show geometrical isomerism

Greater the number of alkyl groups attached to the double bonded Carbon atoms, the less stable is the alkene.

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

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A Hydrocarbon [A] (molecular formula $$\mathrm{C}_3 \mathrm{H}_6$$) on reaction with $$\mathrm{Br}_2 / \mathrm{CCl}_4$$ gave [B]. When [B] is heated with 2 moles of alcoholic $$\mathrm{KOH}$$, it gave compound [C]. 3 moles of Compound [C] when passed through red hot Iron tube forms [D]. Identify [D].

Polypropene

Benzene

Polystyrene

1, 3, 5- Trimethylbenzene

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