Aliphatic Hydrocarbons MCQs

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MCQ's with answers from chapter 8 Aliphatic Hydrocarbons chemistry book 2 for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.
  1. Valencies in alkanes are _____________
  1. Completely satisfied
  2. Partially satisfied
  3. No satisfied
  4. No general rules

  1.       Alkanes containing one branch on main chain are called_________

a) Iso                      b) Normal
c) Neo                    d) Branched

  1.       When one hydrogen atom of alkane is replaced/removed, then it is called_________

  1. Alkene
  2. Alkyl
  3. Aldehyde
  4. Saturated hydrocarbon

  1.       Alkanes are also known as _______

  1. Saturated hydrocarbon
  2. Unsaturated hydrocarbon
  3. Paraffins
  4. a & c

  1.       Sabatier’s Sendren’s reaction involves
      _________in presence of Ni

a) alkene & H2                   b) alkene & O2
c) alkene & N2                   d) alkene & Cl2

  1.       Zn is a good___________

a) Metal                  b) Oxidizing agent
c) Non-metal           d) Reducing agent

  1.       Removal of -COOH is called______

a) Carboxylation      b) Decarboxylation
c) Esterification       d) Hydroxylation

  1.       Soda lime is a mixture of_____________

  1. CaO and KOH  
  2. CaO and NaOH
  3. NaOH and NaO
  4. Nao and KOH

  1.       Malozonide changes into___________

a) Epoxide              b) CO2 + H2O
c) Ozonide              d) CO+H2O





  1.       RCOONa+H2O [Electrolysis] is known as _____

      a) Bosch reaction          b) Kolb reaction
      c) Sabatier’s reactiuon   d) Frankland reaction

  1.       R-Mg-Br is called_________

  1. Grignard reagent
  2. Wurtz reaction
  3. Tollen’s reagent
  4. Pinacol pinacolour reagent

  1.       Upto _____ C atoms, alkanes are gases

a) 2                         b) 3
c) 4                         d) 6

  1.       Alkanes are less reactive than alkenes due to__________

  1. Presence of sigma bond
  2. Absence of pi bonds
  3. Presence of sigma and pi bonds
  4. No justification available

  1.       Introduction of nitro group is called______

a) Nitration              b) Halogenation
c) Sulphonation       d) None

  1.       Order of halogenation is___________

a) I>Cl>Br>F           b) F>Cl>I>Br
c) F>Cl>Br>I           d) Cl>F>Br>I

  1.       Gas is used in fertilizer ____________

a) C2H6                                        b) C2H4
c) C2H2                                        d) CH4

  1.       General formula of alkenes is _______

a) CnH2n+2                                 b) CnH2n-2
c) CnH2n                                      d) CnH2n-x

  1.       The order of dehydration of alcohol is____

  1. sec>pri>ter      
  2. pri>sec>ter
  3. ter>sec>pri
  4. no specificity occurs

  1.       Removal of halogen and hydrogen atom is___

  1. Halogenation    
  2. Dehalogenation
  3. Dehydrohalogenation
  4. Carbonations




  1.       Alkenes are produced from Dehalogenation of_______

      a) di-halides alkane        b) tri-halides alkane
      c) vic. Di-halide             d) vic. Trihalides

  1.       Reactivity due to pi- electrons is present in  ____________

a) Alkane                 b) Alkene
c) Alkyne                 d) b and c

  1.       π- electrons favour____________

  1. Less reactivity
  2. Addition reactions
  3. Substitution reactions
  4. None

  1.       Raney nickel is____________

  1. An alloy of Ni-Cu
  2. Alloy of Ni-Fe
  3. Alloy of Ni-Al
  4. Alloy of Ni-Mg

24.        Which member of IV A has little tendency to form anions or cations?

a) Pb                            b) Sn
c) Ge                            d) C

25.        Alkanes due to little chemical reactivity are also called

a) Olefins                      b) Paraffins
c) Grignard’s reagent     d) None of these

26.        Methane and other members of paraffins do not react with aqueous solution of acids, alkalies, KMnO4 or other oxidizing agents this lack of reactivity is due to its nature

a) Polar                         b) Nonpolar
c) Acidic                       d) Basic

27.        Which hybrid orbital will form the compound CH3 – CH = CH – CH2 – CH3

a) SP2 and SP              b) SP2 and SP3
c) SP                            d) SP3

28.        Which of the following types of reactions occur when a reactant has a double bond?

a) Substitution               b) Addition
c) Photolysis                 d) Polymerization

29.        Among the following orbital bonds, the angle is minimum between

a) SP3 bond                 b) Px and Py orbitals
c) H – O – H in water      d) SP bond


30.        The compound with highest boiling point is

a)     n – hexane             
b)    n – pentane
c)     2 – methyl butane
d)    2, 2 – dimethyl propane

31.        Alcoholic KOH solution is used for

a)     Dehydrogenation
b)    Dehalogenation
c)     Dehydrohalogenation
d)    Dehydration

32.        Which is least soluble in water?

a) Phenol                      b) Benzene
c) Benzoic acid             d) Ethanol

33.        Baeyer’s test is use to detect the bond in an organic compound

a) Single bond              b) Double bond
c) Triple bond                d) All of these

34.        Ethylene reacts with Baeyer’s reagent to form

a) CO2 and H2O             b) Ethyl alcohol
c) Ethylene oxide          d) Ethylene glycol

35.        When ethylene reacts with chlorine to form an oily product. This oily product is called

a) Baeyer’s test             b) Bromine water
c) Dutch – liquid                        d) Glycol

36.        Which of them is used as general anesthetic?

a) Ethane                      b) Ethene
c) Ethyne                      d) Ether

37.        The positive part of the adding molecule will go to that carbon which has greater number of hydrogen atoms. This statement is called

a)     Hoffmann’s Rule
b)    Baeyer’s Strain theory
c)     Thiele’s theory
d)    Markownikoff’s rule

38.        Bromo Ethane on treatment with alcoholic KOH yields

a) Propane                    b) Ethene
c) Ethylene                    d) Acetylene

39.        Metallic carbide on treatment with water gives out a colourless gas which burns readily in air and gives a red precipitate with Cu2Cl2 + NH4OH. The gas is

a) CH4                                                      b) C2H6
c) C2H4                                                    d) C2H2

40.        When acetylene reacts with 10% H2SO4 in the presence of HgSO4 yields

a) CH3OH                      b) CH3COOH
c) CH3CHO                    d) CH3OCH3

41.        Dehydration of Ethanol gives

a) C2H4                                                    b) C2H2
c) C2H6                                                    d) C2H4O

42.        Which of the following has active hydrogen?

a)  C2H2                          b) C2H4
c) C2H6                                                    d) CH4

43.        Treatment of propene with cold concentrated H2SO4 followed by boiling water forms

a) Propyne                    b) Propanol
c) Propanal                   d) 2 – Propanol

44.        Markownikoff’s rule provides guidance for addition of HBr in

a)     CH2 = CH – CH3
b)    CH2 = CH2
c)     CH3 – CH = CH – CH3
d)    None of these

45.        The compound having both SP and SP3 hybridized carbon atom is

a) Propene                    b) Propane
c) Propyne                    d) All of these

46.        PVC is a polymer of

a) CH2 = CH2                                   b) C2H6
c) CH2 = CH Cl              d) C2H2

47.        The structural formula of the compound which yields ethylene upon reaction with Zinc is

a) CH2Br – CH2Br           b) C2H3Br
c) C2H2                                                    d) C2H5OH

48.        The major reactions occur in alkanes are

a)     Electrophilic addition reaction
b)    Nucleophilic substitution reaction
c)     Free radical substitution reaction
d)    Free radical addition reaction

49.        Consider a reaction
            CH3 – CH = CH2 + H – X → product
            The reaction occurs by obeying

a)     Wurtz’s rule
b)    Frankland’s rule
c)     Markownikoff’s rule
d)    Kekule’s rule


50.        Acetylene is used as a starting material for the preparation of Plastics, Synthetic rubber and Synthetic fibre called

a) Orlon                        b) Narlon
c) Corlon                       d) Forlon

51.        The high polymer of chloroprene is

a) Polythene                  b) Benzene
c) Neoprene                  d) Vinyl acetylene

52.        Which one of the following gives Ethyne on electrolysis?

a) Sodium Acetate         b) Sodium Succinate
c) Sodium Formate        d) Sodium Fumerate

53.        Ethene on interaction with hypochlorous acid gives

a)     Dichloro acetaldehyde
b)    Dichlorohydrin
c)     Ethylene chlorohydrin
d)    Ethylene Dichlorohydrin

54.        The compounds having Pi bonds are in general

a) More reactive            b) Less reactive
c) Neutral                      d) Both a & b

55.        Which one will not decolourize bromine water?

a) Ethene                      b) Ethyne
c) Propene                    d) Butane

56.        Acetylene adds on to HCN to give

a)     Acetylene cyanide
b)    Cyanoacetylene
c)     Vinyl ethane
d)    Acrylonitrile

57.        Action of HOCl with ethene to give ethylene chlorohydrin is an example of

a)     Displacement reaction
b)    Substitution reaction
c)     Addition reaction
d)    Polymerization reaction

58.        Chloroform is stored in dark coloured bottles because in light it is

a)     Reduced to CCl4
b)    Oxidized to CCl4
c)     Reduced to phosgene
d)    Oxidized to a poisonous phosgene



59.        Formation of alkane by the action of zinc on
            alkyl halide is called ________

            a) Frankland reaction
            b) Wurtz reaction
            c) Cannizzaro’s reaction
            d) Kobe’s reaction

60.        The alkynes have _______

            a) Tetrahedral frame work
            b) Planar molecules
            c) Linear structure
            d) None of these

61.        The alkenes have _______

            a) Tetrahedral frame work
            b) Planar molecule
            c) Linear structure
            d) None of these

62.        Alkenes undergo _______

            a) Addition reaction
            b) Substitution reaction
            c) Both addition & substitution reaction
            d) None of these

63.        _______ does not react with aqueous solution
            of acids, alkalies, or potassium permanganate
            or other oxidizing agents and most of the usual
            laboratory reagents.  

            a) Benzene                    b) Ether
            c) Methane                    d) Acetic acid

64.        The IUPAC name for the following compound
            is
                        CH3                 CH2CH2CH3
                          │                   │
            CH3  –  CH  –  CH   –  CH – CH = CH2
                                    │
                                  CH3
a) 4, 5 – dimethyl – 3 – propyl – 2 – hexene
b) 4, 5 – dimethyl – 3 – propyl – 1 – hexene
c) 3– propyl – 3 – dimethylpropyl – 1 – hexane
d) 2, 3 – dimethyl – 4 – propyl – 5 – hexane

65.        Markovnikov addition of KCl to propene
            involves,

            a) Initial attack by a chloride ion
            b) Isomerization of 1 – chloropropane
            c) Formation of n – propyl cation
            d) Formation of isopropyl cation


66.        When an aqueous solution of sodium or potassium salt of mono carboxylic acid is subjected to electrolytic, corresponding alkane
            is formed. This reaction is called ________

            a) Sabatier Senderens Reaction
            b) Kolbe’s Electrolysis
            c) Polymerization          
            d) Chlroination

67.        The elimination of hydrogen halide (HX) from
            adjacent carbon atoms is called ________

            a) Pyrolysis                       b) Chlorination
            c) Dehydrohalogenation     d) None

68.        When a mixture of ethane and air is passed
            over heated silver under pressure, we get
            _____

            a) Epoxide                    b) Super oxide
            c) Suboxide                  d) None

69.        The process used for the preparation of
            acetylene is _______

            a) Berthelot Process     
b) Sabatier – Senderns Reaction
c) Kolbe’s Process
d) Haber’s process

70.        A simple chemical test to distinguish 1, 3-butadiene and 1- butyne is

            a) Br2│CCl4                    b) Ag(NH3)2OH
            c) KMnO4                      d) None

I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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