Hydrocarbons – Multiple Choice Questions

Q1. The electrophile in nitration of benzene reaction is:

  1. NO2
  2. NO3
  3. NO2+
  4. NO

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Q2. Partially deactivated palladised charcoal is known as:

  1.  Lassaigne catalyst
  2.  Kharash catalyst
  3.  Birch catalyst
  4. Lindlar’s catalyst

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Q3. Necessary condition for halogenation in benzene is:

  1. Inert atmosphere of nitrogen
  2. Presence of halogen carrier
  3. H2SO4
  4. Fe catalyst

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Q4. 2-Bromo-3-methyl butane on treatment with alcoholic KOH forms 2-Methyl-2-butene.The product formed is in accordance with which rule:

  1. Markovnikov’s rule
  2. Anti-Markovnikov’s rule
  3. Saytzeff rule
  4. Huckel’s rule

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Q5. Combustion of alkanes carried in limited supply of oxygen results in the formation of:

  1. Carbon dioxide
  2. Alcohol
  3. Carbon monoxide/carbon particles
  4. Branched alkanes

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Q6. In case of  Unsymmetrical alkenes addition reaction of alkyl halides in absence of peroxide  takes place according to:

  1. Anti Markovnikov rule
  2.  Markovnikov rule
  3.  Kharash effect
  4.  Peroxide effect

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Q7. The melting point of the symmetrical alkanes is:

  1. More than unsymmetrical alkanes
  2. Less than unsymmetrical alkanes
  3. Same as that of unsymmetrical alkanes
  4. None of the above

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Q8. The starting material used during preparation of alkanes by Wurtz method:

  1. Alkyl halide
  2. Carboxylic acid
  3. Sodium salt of carboxylic acid
  4. Alkene

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Q9. Alkenes react with water in presence of  a few drops of conc. sulphuric acid to form:

  1. Vicinal  glycols
  2. Geminal glycols
  3. Both (A) & (B)
  4. None of the above

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Q10. The chlorination of alkanes is initiated by homolysis of chlorine molecule because:

  1. Cl-Cl bond is stronger than C-H bond
  2. Cl-Cl bond is stronger than C-C bond
  3. Cl-Cl bond is weaker than C-H bond and C-C bond
  4. Cl-Cl bond is strongest bond

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Q11. Amongst the following, the compound that can be most readily sulphonated is:

  1. Benzene
  2. Nitrobenzene
  3. Toluene
  4. Chlorobenzene

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Q12. The compound which is most reactive towards electrophilic substitution is:

  1. Toluene
  2. Benzene
  3. Nitrobenzene
  4. Benzoic acid

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Q13. The halogen which is most reactive in the halogenation of alkanes under sunlight is:

  1. Chlorine
  2. Bromine
  3. Iodine
  4. Fluorine

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Q14. How many isomers does C6H14 have?

  1. 3
  2. 5
  3. 6
  4. 7

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Q15. Methyl benzene can be prepared by the reaction of benzene with:

  1. CH3Cl in the presence of AlCl3
  2. CH4 in the presence of Al
  3. C2H5Cl in the presence of AlCl3
  4. CH3COCl in the presence of AlCl3

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Q16. When 2-butyne is passed through red hot iron tube, the product formed is:

  1. Benzene
  2. 1,2,4- Trimethylbenzene
  3. Ethyl benzene
  4. 1,2,3,4,5,6-Hexamethylbenzene

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Q17. Propyl  bromide in presence of  Alc. KOH gives:

  1. Propene
  2. Ethene
  3. Hexene
  4. 2-bromopropene

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Q18. Alkynes do not show geometrical isomerism because:

  1. They are linear.
  2. They are polar.
  3. They have high melting points.
  4. They are soluble in water.

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Q19. When 1,2-dibromopropane reacts with alcoholic KOH and soda amide, it gives:

  1. Propyne
  2. Ethyne
  3. Propane
  4. Propene

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Q20. The presence of resonance in benzene is justified on the basis of:

  1. C-C bond length
  2. C-H bond length
  3. Both(1) and(2)
  4. None

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Q21. Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds Benzene, methyl benzene, Chlorobenzene, nitro benzene:

  1. 1>2>3>4
  2. 4>3>2>1
  3. 2>1>3>4
  4. 2>1>4>3

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Q22. Amongst the following the compound that is nitrated with difficulty:

  1. Benzene
  2. Nitrobenzene
  3. Toluene
  4. Phenol

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Q23. Alkanes having six or more carbon atoms on heating in presence of oxides of vanadium get cyclised to benzene . This reaction is known as:

  1. Aromatization
  2. Controlled Oxidation
  3. Pyrolysis
  4. Isomerization

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Q24. Select the preparation method that is not used to produce unsymmetrical alkane.

  1. Kolbe’s method
  2. From Grignard Reagent
  3. Wurtz method
  4. Catalytic hydrogenation of alkenes

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Q25. β-elimination reaction is also known as:

  1.  Dehalogenation
  2. Birch reduction
  3. Dehydrohalogenation
  4. Acidic dehydration

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Q26. A compound mistakenly named 3,4-dimethylbutane should be named correctly as:

  1. 4-methylpentane
  2. 2-methylpentane
  3. 3-methylpentane
  4. 1-methylpentane

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Q27. Alkynes on reduction form trans alkenes in presence of:

  1.  Na/Liquid NH3
  2.  Pd/C
  3. Conc.H2SO4
  4. Alc. KOH

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Q28. Aqueous solution of  Potassium permanganate is known as:

  1. Lassaigne reagent
  2.  Baeyer’s reagent
  3.  Carius reagent
  4. Dumas reagent

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Q29. Cis isomer have:

  1. High boiling point  than trans isomer
  2. Lower boiling point than trans isomer
  3.  Same boiling point
  4.  None of the above

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Q30. Reddish orange colour of the solution of bromine in carbon tetrachloride decolourises. This is a test for:

  1. Unsaturation
  2. Alcohol
  3. Carbonyl compounds
  4. Saturation

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Q31. The methyl group in benzene ring is:

  1. ortho directing
  2. ortho and meta directing
  3. para directing
  4. ortho and para directing

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Q32. Ethene and ethyne can be distinguished by:

  1. Bromine water
  2. KMnO4 solution
  3. Ammoniacal Cuprous chloride solution
  4. Any of the above

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Q33. Peroxide effect proceeds by formation of:

  1. Free radical
  2. Carbocation
  3. Carbanion
  4. Carbenes

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Q34. Geometrical isomerism is a type of:

  1.  Structural isomerism
  2.  Stereoisomerism
  3.   Both (1) and (2)
  4.  None of the above

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Q35. Propene reacts with sulphuric acid to form:

  1. Propene hydrogen sulphate
  2. Propane hydrogen sulphate
  3. Propyl hydrogen sulphate
  4. Propyl sulphate

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Q36. Fluorination is violent, it is carried out in the presence of:

  1. HCl
  2. HNO3
  3. Cu
  4. Ni

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Q37. When But-2-yne  reacts with HBr ,it gives:

  1. 1,2-dibromobutane
  2. 2,2-dibromobutane
  3. 2,3- dibromobutane
  4. 1,1-dibromobutane

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Q38. A water molecule eliminated from alcohol molecule in the presence of acid is known as:

  1. Dehalogenation
  2. Dehydrohalogenation
  3. Acidic dehydration
  4. Birch reduction

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Q39. Aromatic compound containing Benzene Ring are known as:

  1. Benzenoids
  2. Alkynes
  3. Non-Benzenoids
  4. Arenes

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Q40. Photochemical chlorination of alkane is initiated by  process called:

  1. Pyrolysis
  2. Homolysis
  3. Substitution
  4. Peroxidation

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