Hydrocarbons · Chemistry · COMEDK

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MCQ (Single Correct Answer)

1
Identify the Alkane (molecular formula $\mathrm{C}_8 \mathrm{H}_{18}$ ) which yields only a single monochloride on Chlorination in the presence of sunlight.
COMEDK 2025 Evening Shift
2
The number of grams of bromine that will completely react with 5 g of pentene is : [Atomic mass of $\mathrm{Br}=80 \mathrm{u}$ ]
COMEDK 2025 Evening Shift
3
Which of the following alkene on reductive ozonolysis gives ketones only as the product
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4

What would be the major product formed in the reaction?

COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 2 English

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5

Consider the following reaction

$$\text { Propyne }+\mathrm{CH}_3 \mathrm{MgBr} \xrightarrow{\text { dry ether }} \mathbf{X}$$

Identify ' X ' from the following.

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6

Identify the type of reaction:

COMEDK 2025 Evening Shift Chemistry - Hydrocarbons Question 1 English

COMEDK 2025 Evening Shift
7

Identify the Carbonyl compound which will not be formed when hydration of Alkynes is carried out with dil. $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{Hg}^{2+}$ at 333 K .

Acetone, Butanal, Ethanal, Butanone.

COMEDK 2025 Evening Shift
8
An Alkene " X " on reaction with hot acidified $\mathrm{KMnO}_4$ gave a mixture of Ethanoic acid and Propanone. Identify " X ".
COMEDK 2025 Afternoon Shift
9

Match the reactions in Column I with the correct products given in Column II

S.No. Column I S.NO. Column II
A. 1- Chloropropane $+(\mathrm{Zn} / \mathrm{HCl}) \rightarrow$ P. Propanone + Methanal
B. n- Hexane $+\left(\right.$ anh. $\left.\mathrm{AlCl}_3 / \mathrm{HCl}_{(\mathrm{g})}\right) \rightarrow$ Q. Propanone
C. 2- Methylpropene $+\left(\mathrm{O}_3 \& \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}\right) \rightarrow$ R. Propane
D. Propyne $+\left(\mathrm{HgSO}_4 / \mathrm{H}_2 \mathrm{SO}_4\right.$ at 333 K$) \rightarrow$ S. 2-Methylpentane + 3-Methylpentane

COMEDK 2025 Afternoon Shift
10
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 $\mathbf{b}$.
COMEDK 2025 Afternoon Shift
11

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

COMEDK 2025 Morning Shift Chemistry - Hydrocarbons Question 11 English

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12
Which one of the following statements is correct?.
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13

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].

COMEDK 2024 Evening Shift
14

Identify the product $$[\mathrm{C}]$$ formed at the end of the reaction below

1,1,2,2- Tetrabromopropane + 2 $$\mathrm{Zn}_{(\mathrm{S})}$$ / Ethanol $$\rightarrow$$ [B]

$$[\mathrm{B}]$$ + 2 moles of $$\mathrm{HBr} \rightarrow[\mathrm{C}]$$

COMEDK 2024 Evening Shift
15

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and 1 forms. Identify these 2 reactions.

[A] 2- Methylpropene + $$\mathrm{HI} \rightarrow$$ ---------

[B] But-1-ene + $$\mathrm{HBr} \rightarrow$$ -----------

[C] 3-Methylbut-1-ene + $$\mathrm{HI} \rightarrow$$ -----------

[D] 3- Phenylpropene + $$\mathrm{HBr}$$ (Peroxide) $$\rightarrow$$ -----------

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16

Which of the following reactions is an example for incomplete combustion?

COMEDK 2024 Afternoon Shift
17

An unsaturated hydrocarbon $$[\mathrm{A}]$$ reacts with $$\mathrm{HBr}$$ in presence of Benzoyl peroxide to yield [B] Compound [A] when reacted with cold, dilute alkaline $$\mathrm{KMnO}_4$$ gave compound [C], 2-Methylbutane-2, 3-diol But when [A] is reacted with hot $$\mathrm{KMnO}_4$$, it yielded $$\mathrm{CH}_3 \mathrm{COOH}$$ and a compound [D] Identify compounds [A], [B] and [D]

COMEDK 2024 Morning Shift
18

An aromatic hydrocarbon $$[\mathrm{A}]\left(\mathrm{Molecular}\right.$$ formula $$\left.\mathrm{C}_9 \mathrm{H}_{12}\right)$$, undergoes air oxidation followed by reaction with dil. $$\mathrm{HCl}$$ to give [B] as one of the products

Compound [B] forms a white precipitate on treatment with $$\mathrm{Br}_2(\mathrm{aq})$$

Sodium salt of [B] reacts with $$\mathrm{CO}_2$$ at $$400 \mathrm{~K}$$ under high pressure followed by acid hydrolysis to give [C]

Compound [C] reacts with acetic anhydride / conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ to form [D] Identify compound $$[\mathrm{D}]$$

COMEDK 2024 Morning Shift
19

Ammoniacal silver nitrate forms a white precipitate easily with

COMEDK 2023 Morning Shift
20

The conversion of Propyne to Benzene can be brought out in 4 steps.

Choose the reagents to be used, in the proper sequential order, to bring out the conversion.

Reagents provided: alc. $$\mathrm{KOH}, \mathrm{H}_2 / \mathrm{Pd}, \mathrm{Na} /$$ dry ether, $$\mathrm{HBr}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2$$, Soda-lime, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high T and P), Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$

COMEDK 2023 Evening Shift
21

Identify the reagents $$\mathrm{X}, \mathrm{Y}$$ and $$\mathrm{Z}$$ used to bring out the following reactions.

COMEDK 2023 Evening Shift Chemistry - Hydrocarbons Question 19 English

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22

What can be A and B in the following reaction?

COMEDK 2022 Chemistry - Hydrocarbons Question 23 English

COMEDK 2022
23

Which of the product is not possible in Wurtz reaction?

COMEDK 2022
24

Coupling reaction is an example of

COMEDK 2021
25

The hydrocarbon that cannot be prepared effectively by Wurtz reaction

COMEDK 2021
26

What is the product formed when benzene react with CO and HCl in presence of anhydrous AlCl$$_3$$?

COMEDK 2021
27

The general formula of a cycloalkene is

COMEDK 2020
28

According to Baeyer's strain theory which is highly stable?

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