Class 11 Chemistry Chapter 13 Hydrocarbons MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 13 Hydrocarbons. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practising these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

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Class 11 Hydrocarbons MCQs

1. When acetylene is treated with HBr, the product is ———-

(a) Methyl bromide

(b) Ethylene bromide

(c) Ethyl bromide

(d) Ethylidene bromide

Ans: (d)

Solution: Ethylidene bromide is formed.

CH≡CH + HBr → CH₂=CHBr + HBr → CH₃-CHBr₂

2. The dihedral angle in the staggered conformation of C2H6 is

(a) 120⁰

(b) 60⁰

(c) 0⁰

(d) 90⁰

Ans: (b)

Solution: The dihedral angle is 60⁰.

3. Bond length of (I) ethane, (II) ethene, (III) acetylene and (IV) benzene follows the order:

(a) I > II > III > IV

(b) I > II > IV> III

(c) I > IV > II > III

(d) III > IV > II > I

Ans (c)

Solution: Bond order is inversely proportional to bond length: I > IV > II > III

4. Which of the following participate in the sulphonation of benzene?

(a) SO₂

(b) SO₃H⁺

(c) SO₃

(d) SO₃H^–

Ans: (c)

Solution: SO₃ participates in the sulphonation of benzene.

5. Which one of the following is not an isomer of 3-Methylbut-1-yne?

(a) Pent-1-yne

(b) Buta-1,3-diene

(c) Pent-2-yne

(d) Penta-1,3-diene

Ans: (b)

Solution: Buta-1,3-diene (four carbon atoms) is not an isomer of 3-Methylbut-1-yne (five carbon atoms)

6. Which of the following can be used as the halide component of a Friedel craft reaction?

(a) Chlorobenzene

(b) Bromobenzene

(c) Chloroethene

(d) Isopropyl chloride

Ans: (d)

Solution: Only isopropyl chloride can be used as the halide component for Friedel craft reaction. In all other cases, the cleavage of the C-X bond is not possible.

7. Which of the compounds show dipole moment?

(a) 1,4-dichlorobenzene

(b) 1,2-dichlorobenzene

(c) trans-1,2-dichloroethane

(d) trans-but-2-ene

Ans: (b)

Solution: 1,2-dichlorobenzene shows dipole moment because the rest are all symmetrical in nature.

8. Which of the following compounds will exhibit cis-trans isomerism?

(a) Butanol

(b) 2- Butyne

(c) 2-Butenol

(d) 2-Butene

Ans: (d)

Solution: CH₃CH=CHCH₃ will exhibit geometrical isomerism.

9. Benzene reacts with CH₃Cl in the presence of anhydrous AlCl₃ to form

(a) Chlorobenzene

(b) Benzyl chloride

(c) xylene

(d) toluene

Ans: (d)

Solution: Benzene reacts with CH₃Cl in the presence of anhydrous AlCl₃ undergoes Friedel craft alkylation which produces toluene.

10. What happens when a mixture of acetylene and hydrogen is passed over heated Lindlar’s catalyst?

(a) Ethylene and water are formed

(b) Ethane and water are formed

(c) Ethylene is formed

(d) Acetylene and ethane are formed

Ans: (c)

Solution: Ethylene is formed as a result of controlled hydrogenation of acetylene.

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