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Hydrocarbons Class 11 MCQs Questions with Answers
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: (b) 1, 3-Dinitrobenzene
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
(a) –C ≡ N
(b) -SO3H
(c) -COOH
(d) -NO2
Answer: (d) -NO2
The orth/para-drecting group among the following is
(a) COOH
(b) CN
(c) COCH3
(d) NHCOCH3
Answer: (d) NHCOCH3
Tetrabromoethane on heating with Zn gives
(a) Ethyl bromide
(b) Ethane
(c) Ethene
(d) Ethyne
Answer: (d) Ethyne
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: (d) (iv) > (ii) > (i) > (iii)
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: (d) Ammonical silver nitrate
An organic compound has a triple bond and not double bond. It can be test by
(a) Bromine water
(b) Baeyer reagent
(c) Fehling solution
(d) Ar nonical silver nitrate
Answer: (d) Ar nonical silver nitrate
The angle strain in cyclobutane is
(a) 24°44
(b) 29°16
(c) 19°22
(d) 9°44
Answer: (d) 9°44
Tetrabromoethane on heating with Zn gives
(a) Ethyl bromide
(b) Ethane
(c) Ethene
(d) Ethyne
Answer: (d) Ethyne
A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is __
(a) 1, 4-dibromobutane
(b) 1, 2-dibromoethane
(c) carbon
(d) none of the above
Answer: (a) 1, 4-dibromobutane
Hydrocarbon containing following bond is most reactive
(a) C ≡ C
(b) C = C
(c) C-C
(d) All of these
Answer: (a) C ≡ C
The first fraction obtained during the fractionation of petroleum is:
(a) Gasoline
(b) Diesel Oil
(c) Hydrocarbon Gases
(d) Kerosene Oil
Answer: (c) Hydrocarbon Gases
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: (a) There are three carbon-carbon single bonds and three carbon-carbon double bonds
Which alkene on ozonolysis gives CH3CH2CHO and CH3COCH3?
(a) CH2 = CH CH = C(CH3)2
(b) CH3 CH2CH = CH CH2CH3
(c) CH3CH2 CH = CH – CH3
(d) (CH3)2 C = CH CH3
Answer: (a) CH2 = CH CH = C(CH3)2
In the compound CH2 = CH – CH2 – CH2C = CH2 the C2 – C3 bond is of the type
(a) sp – sp²
(b) sp³ – sp³
(c) sp – sp³
(d) sp² – sp³
Answer: (d) sp² – sp³
The number and type of bonds between two carbon atoms in CaC2 are
(a) One sigma (σ) and one pi (π) bonds
(b) One sigma (σ) and two pi (π) bonds
(c) One sigma (σ) and one and a half pi (π) bonds
(d) One sigma (σ) bond.
Answer: (b) One sigma (σ) and two pi (π) bonds
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: (a) 2 – Phenyl – 2 – propanol
The coal tar fraction which contains phenol is
(a) Heavy Oil
(b) Light Oil
(c) Middle Oil
(d) Green Oil
Answer: (c) Middle Oil
Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
(a) Neopentane
(b) Carbon
(c) Isohexane
(d) Neohexane
Answer: (a) Neopentane
Aromatic compounds burn with a sooty flame because
(a) They have a ring structure of carbon atoms
(b) They have a relatively high percentage of hydrogen
(c) They have a relatively high percentage of carbon
(d) They resist reaction with oxygen of air
Answer: (c) They have a relatively high percentage of carbon
The catalyst used in Friedel – Crafts reaction is
(a) Aluminium Chloride
(b) Anhydrous Aluminium Chloride
(c) Ferric Chloride
(d) Copper .
Answer: (b) Anhydrous Aluminium Chloride
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: (d) Deactivates the ring towards electrophilic substitution
The number of structural isomers for C6H14 is
(a) 3
(b) 4
(c) 5
(d) 6
Answer: (c) 5
Alkyl halides react with dialkyl copper reagents to give
(a) Alkanes
(b) Alkenes
(c) Hydrogen
(d) Carbon
Answer: (a) Alkanes
The lowest alkene, that is capable of exhibiting geometrical isomerism is
(a) Ethene
(b) But – 1- ene
(c) But – 2 – ene
(d) Propene
Answer: (c) But – 2 – ene
On mixing certain alkane with chlorine and irradiating it with ultraviolet light, one forms only one monochloro alkane. The alkane could be
(a) Neopentane
(b) Propane
(c) Pentane
(d) Isopentane
Answer: (a) Neopentane
The position of double bond in alkenes can be located by
(a) Hydrogenation of oil
(b) Ozonolysis
(c) Photolysis
(d) Hydration
Answer: (b) Ozonolysis
Isopropyl bromide on Wurtz reaction gives
(a) Hexane
(b) Propane
(c) 2, 3 – Dimethylbutane
(d) Neohexane
Answer: (c) 2, 3 – Dimethylbutane
Pure methane can be prepared by
(a) Soda lime decarboxylation
(b) Kolbes electrolytic method
(c) Wurtz reaction
(d) Reduction with H2
Answer: (a) Soda lime decarboxylation
Butene-1 may be converted to butane by reaction with
(a) Pd/H2
(b) Zn – HCl
(c) Sn – HCl
(d) Zn – Hg
Answer: (a) Pd/H2
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