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Hydrocarbons Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
When 2-butyne is treated with dil.H2SO4/HgSO4, the product formed is
(a) Butanol-1
(b) Butanol-2
(c) 2-Butanone
(c) Butanal
Answer
Answer: (c) 2-Butanone
Question 2.
Identify the compound A and B in the following reaction sequence
(a) A is ethylene, B is acetadehyde
(b) A is acetylene, B is propionaldehyde
(c) A is ethane, B is ethanol
(d) A is acetylene, B is acetaldehyde.
Answer
Answer: (d) A is acetylene, B is acetaldehyde.
Question 3.
The orth/para-drecting group among the following is
(a) COOH
(b) CN
(c) COCH3
(d) NHCOCH3
Answer
Answer: (d) NHCOCH3
Question 4.
When propyne is treatd with HgSO4/H2SO4 the product is
(a) Propanol
(b) Propanal
(c) Propanone
(d) Propanoic acid
Answer
Answer: (c) Propanone
Question 5.
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
Answer: (d) Ar nonical silver nitrate
Question 6.
Butene-1 may be converted to butane by reaction with
(a) Pd/H2
(b) Zn – HCl
(c) Sn – HCl
(d) Zn – Hg
Answer
Answer: (a) Pd/H2
Question 7.
Tetrabromoethane on heating with Zn gives
(a) Ethyl bromide
(b) Ethane
(c) Ethene
(d) Ethyne
Answer
Answer: (d) Ethyne
Question 8.
An organic compound on treatment with Br2 in CCl4 gives. bromo derivative of an alkene. The compound will be
(a) CH3 – CH = CH2
(b) CH2 – CH = CH – CH2
(c) CH ≡ CH
(d) CH2 = CH2
Answer
Answer: (c) CH ≡ CH
Question 9.
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
Answer: (a) CH2 = CH CH = C(CH3)2
Question 10.
The compound
on reaction with NaIO4 in presence of KMnO4 gives
(a) CH3COCH3
(b) CH3COCH3 + CH3COOH
(c) CH3COCH3 + CH3CHO
(d) CH3CHO + CO2
Answer
Answer: (b) CH3COCH3 + CH3COOH
Question 11.
When CH3CH2CHCl2 is treated with NaNH2, the product is
(a) CH3 – CH – CH2
(b) CH3 – C ≡ CH
(c) CH3CH2CH (NH2)2
Answer
Answer: (b) CH3 – C ≡ CH
Question 12.
The treatment of benzene with isobu.ene in the presence of sulphuric acid gives
(a) Isobutyl benzene
(b) Tert-butyl benzene
(c) n-Butyl benzene
(d) No reaction
Answer
Answer: (b) Tert-butyl benzene
Question 13.
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
Answer: (d) sp² – sp³
Question 14.
Which of the following compounds will exhibit geometrical isomerism?
(a) 1-pheny 1-2-butene
(b) 3-phenyl-1-butene
(c) 2-phenyl-1-butene
(d) 1,1-diphenyl-1-propene
Answer
Answer: (a) 1-pheny 1-2-butene
Question 15.
Which of the following compounds exhibits steroisomerism?
(a) 2-methyl butene-1
(b) 3-methyl butyne-1
(c) 3-methylbutanoic acid
(d) 2-methylbutanoic acid
Answer
Answer: (d) 2-methylbutanoic acid
Question 16.
Out of the following which one has the least hindered rotation about carbon-carbon bond.
(a) Ethane
(b) Ethylene
(c) Acetylene
(d) Hexachloroethane
Answer
Answer: (a) Ethane
Question 17.
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
Answer: (b) One sigma (σ) and two pi (π) bonds
Question 18.
Which of these will not react w ith acetylene?
(a) NaOH
(b) Ammoniacal AgNO3
(c) Na
(d) HCl
Answer
Answer: (a) NaOH
Question 19.
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
Answer: (a) Neopentane
Question 20.
The correct order of reactivity towards the electrophilic substitution of the compounds (i) aniline (ii) benzene (iii) nitrobenzene is
(a) III > II > I
(b) II > III > I
(c) I < II > III
(d) I > II > III
Answer
Answer: (d) I > II > III
Question 21.
Which of the following species participate in salphonation of benzene ring?
(a) H2SO4
(b) SO3
(c) HSO(_3^-)
(d) SO(_2^-)
Answer
Answer: (b) SO3
Question 22.
The Number of structural isomers for C6H14 is
(a) 3
(b) 4
(c) 5
(d) 6
Answer
Answer: (c) 5
Question 23.
Propene on reaction with chlorine water gives
Answer
Answer: (a)
Fill in the blanks
Question 1.
The terminal carbon in butane is …………….. hybridized.
Answer
Answer: sp³
Question 2.
2-Butanol on dehydration gives mainly ……………..
Answer
Answer: butene-2
Question 3.
Propene on ozonolysis forms ……………..
Answer
Answer: acetaldehyde & formaldehyde
Question 4.
Pi (π) bond is formed due to overlap of the unhybridized …………….. orbitals.
Answer
Answer: p
Question 5.
The sp² hybrid orbitals have …………….. p-character.
Answer
Answer: 66.7%
Question 6.
Benzene has …………….. hydrogen atoms less than the corresponding alkane.
Answer
Answer: 8
Question 7.
A linear structure is obtained during sp hybridization as in ……………..
Answer
Answer: alkynes
Question 8.
A regular …………….. is obtained during sp³ hybridization as in alkanes.
Answer
Answer: tetrahedron
Question 9.
Although chlorine is o, p-directing, it …………….. the benzene nucleus towards electrophilic substitution.
Answer
Answer: deactivates
Question 10.
Solubility of alkenes …………….. with the increase in molecular mass.
Answer
Answer: decreases
Write True / False
Question 1.
Alkyl halides when treated with aqueous KOH give olefins.
Answer
Answer: False
Question 2.
All of the common O, p-directing groups are activating groups towards electrophilic substitution reactions of benzenes.
Answer
Answer: False
Question 3.
In alkanes, carbon shows sp³ hybridization.
Answer
Answer: True
Question 4.
Benzene is an aromatic compound.
Answer
Answer: True
Question 5.
Reduction of an alkene to alkane is an addition reaction.
Answer
Answer: True
Question 6.
During addition of halogen acids across a double bond in alkenes, the halogen atoms go to the carbon atom having higher number of hydrogen atoms.
Answer
Answer: False
Question 7.
Greater is the resonance energy, smaller is the stability of the resonance hybrid.
Answer
Answer: False
Question 8.
π bond is weaker bond than a σ bond.
Answer
Answer: True
Question 9.
2-Methyl propene gives isobutyl bromide with hydrogen bromide.
Answer
Answer: False
Question 10.
Shorter bonds are weak bonds.
Answer
Answer: False
Match the Following
| Column I | Column II |
| 1. State of hybridisation of carbon in cyclohexene. | (a) Removal of a molecule of CO2 from an organic compound. |
| 2. Friedal crafts reaction | (b) Alkyl halides in presence of metallic sodium. |
| 3. Wurtz reaction | (c) Arenes & alkyihalides in presence of anhydrous AlCl3 |
| 4. Decarboxylation | (d) sp |
| 5. State of hybridisation of carbon in ethyne. | (e) sp² |
| 6. The geometrical isomers | (f) NO(_2^+) |
| 7. Substitution reactions are characteristics of | (g) Benzyl chloride |
| 8. Ethylene reacts with Baeyer’s reagent to give | (h) Alkanes |
| 9. Toluene reacts with chlorine in presence of light to give. | (i) Glycol |
| 10. During nitration of benzene the active nitrating agent is | (j) Contain at least one carbon-carbon double bond. |
Answer
Answer:
| Column I | Column II |
| 1. State of hybridisation of carbon in cyclohexene. | (e) sp² |
| 2. Friedal crafts reaction | (c) Arenes & alkyihalides in presence of anhydrous AlCl3 |
| 3. Wurtz reaction | (b) Alkyl halides in presence of metallic sodium. |
| 4. Decarboxylation | (a) Removal of a molecule of CO2 from an organic compound. |
| 5. State of hybridisation of carbon in ethyne. | (d) sp |
| 6. The geometrical isomers | (j) Contain at least one carbon-carbon double bond. |
| 7. Substitution reactions are characteristics of | (h) Alkanes |
| 8. Ethylene reacts with Baeyer’s reagent to give | (i) Glycol |
| 9. Toluene reacts with chlorine in presence of light to give. | (g) Benzyl chloride |
| 10. During nitration of benzene the active nitrating agent is | (f) NO(_2^+) |
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