NCERT Solutions for class 11 Chemistry | Chapter 13 Hydrocarbons

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Questions
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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