MCQ On Class 11 Chemistry Chapter 13 Hydrocarbons

(1) Presence of a nitro group in a benzene ring

[A] Activates the ring towards electrophilic substitution

[B] Renders the ring basic

[C] Deactivates the ring towards nucleophilic substitution

[D] Deactivates the ring towards electrophilic substitution

Answer: Deactivates the ring towards electrophilic substitution

(2) The lowest alkene, that is capable of exhibiting geometrical isomerism is

[A] Ethene

[B] But – 1- ene

[C] But – 2 – ene

[D] Propene

Answer: But – 2 – ene

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(3) Alkyl halides react with dialkyl copper reagents to give?

[A] Alkanes

[B] Alkenes

[C] Hydrogen

[D] Carbon

Answer: Alkanes

(4) The catalyst used in Friedel – Crafts reaction is

[A] Aluminium Chloride

[B] Anhydrous Aluminium Chloride

[C] Ferric Chloride

[D] Copper

Answer: Anhydrous Aluminium Chloride

(5) Which one of these is not true for benzene?

[A] There are three carbon-carbon single bonds and three carbon-carbon double bonds.

[B] Heat of hydrogenation of benzene is less than the theoretical value

[C] It forms only one type of mono substituted product

[D] The bond angle between carbon-carbon bonds is 120 Degree

Answer: There are three carbon-carbon single bonds and three carbon-carbon double bonds.

(6) The coal tar fraction which contains phenol is:

[A] Heavy Oil

[B] Light Oil

[C] Middle Oil

[D] Green Oil

Answer: Middle Oil

(7) 2 – Phenylpropene on acidic hydration gives

[A] 2 – Phenyl – 2 – propanol

[B] 2 – Phenyl – 1 – propanol

[C] 3 – Phenyl – 1 – propanol

[D] 1 – Phenyl – 2 – propanol

Answer: 2 – Phenyl – 2 – propanol

(8) The first fraction obtained during the fractionation of petroleum is:

[A] Gasoline

[B] Diesel Oil

[C] Hydrocarbon Gases

[D] Kerosene Oil

Answer: Hydrocarbon Gases

(9) The angle strain in cyclobutane is

[A] 24°44

[B] 29°16

[C] 19°22

[D] 9°44

Answer: 9°44

(10) Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80 – 100°C forms which one of the following products?

[A] 1, 2-Dinitrobenzene

[B] 1, 3-Dinitrobenzene

[C] 1, 4-Dinitrobenzene

[D] 1, 2, 4-Trinitrobenzene

Answer: 1, 3-Dinitrobenzene

(11) Isopropyl bromide on Wurtz reaction gives

[A] Hexane

[B] Propane

[C] 2, 3 – Dimethylbutane

[D] Neohexane

Answer: 2, 3 – Dimethylbutane

(12) The compound C₃H₄ has a triple bond, which is indicated by its reaction with

[A] Bromine water

[B] Bayers reagent

[C] Fehling solution

[D] Ammonical silver nitrate

Answer: Ammonical silver nitrate

(13) Hydrocarbon containing following bond is most reactive

[A] C ≡ C

[B] C = C

[C] C-C

[D] All of these

Answer: C ≡ C

(14) Pure methane can be prepared by

[A] Soda lime decarboxylation

[B] Kolbes electrolytic method

[C] Wurtz reaction

[D] Reduction with H₂

Answer: Soda lime decarboxylation

(15) The order of decreasing reactivity towards an electrophilic reagent, for the following :

(i) Benzene (ii) Toluene (iii) Chlorobenzene (iv) Phenol would be:

[A] (i) > (ii) > (iii) > (iv)

[B] (ii) > (iv) > (i) > (iii)

[C] (iv) > (iii) > (ii) > (i)

[D] (iv) > (ii) > (i) > (iii)

Answer: (iv) > (ii) > (i) > (iii)

(16) Which of the following compounds will exhibit geometrical isomerism?

[A] 1 – Phenyl – 2 – butene

[B] 3 – Phenyl – 1 – butene

[C] 2 – Phenyl – 1 butene

[D] 1, 1 – Diphenyl – propene .

Answer: 1 – Phenyl – 2 – butene

(17) Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

[A] –C ≡ N

[B] -SO₃H

[C] -COOH

[D] -NO₂

Answer: -NO₂

(18) Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80 – 100°C forms which one of the following products?

[A] 1, 2-Dinitrobenzene

[B] 1, 3-Dinitrobenzene

[C] 1, 4-Dinitrobenzene

[D] 1, 2, 4-Trinitrobenzene

Answer: 1, 3-Dinitrobenzene

(19) The position of double bond in alkenes can be located by :

[A] Hydrogenation of oil

[B] Ozonolysis

[C] Photolysis

[D] Hydration

Answer: Ozonolysis

(20) A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.

[A] 2, 2-dibromobutane

[B] 1, 1-dibromopropane

[C] 1, 4-dibromobutane

[D] 1, 2-dibromoethane

Answer: 1, 4-dibromobutane

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